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ABSTRACT Tenebrionoids are not uncommon in late Mesozoic ambers, but their paleodiversity remains poorly explored, partly due to the insufficiently defined families of the extant fauna. Here, we describe and illustrate a new tenebrionoid beetle from mid‐Cretaceous Kachin amber, Glyphonotum hsiaoi gen. et sp. nov., which exhibits an unusual form of pronotal sulcus and tarsi. Based on morphological comparison and phylogenetic analyses, we tentatively place Glyphonotum in the extant family Pythidae, representing the first Mesozoic fossil of this family.

The tribes Goniaderini Lacordaire, 1859 and Lupropini Lesne, 1926 within the tenebrionid subfamily Lagriinae Latreille, 1825 have previously been shown to be non-monophyletic by molecular phylogenetic analyses. The tribes and constituent genera are here reviewed and redefined morphologically. As part of tribal redefinitions, we establish Prateini New Tribe with type genus Prateus LeConte, 1862. We reestablish the subtribe Phobeliina Ardoin, 1961 Revised Status, which is transferred from Goniaderini and placed as a subtribe of Lagriini Latreille, 1825 where it is comprised of Phobelius Blanchard, 1842, and Rhosaces Champion, 1889 (previously in Lagriini: Statirina Blanchard, 1845). The fossil tribe Archaeolupropini Nabozhenko, Perkovsky, & Nazarenko, 2023 is transferred from Lagriinae to Tetratomidae: Tetratominae Billberg, 1820. Keys to extant tribes and subtribes of Lagriinae and genera of Goniaderini, Lupropini, and Prateini are provided. Generic and species-level changes from this work are as follows: Prateini is comprised of the following 15 genera: Antennoluprops Schawaller, 2007, Ardoiniellus Schawaller, 2013, Bolitrium Gebien, 1914, Enicmosoma Gebien, 1922, Indenicmosoma Ardoin, 1964, Iscanus Fauvel, 1904, Kuschelus Kaszab, 1982, Lorelopsis Champion, 1896, Mesotretis Bates, 1872, Microcalcar Pic, 1925, Micropedinus Lewis, 1894, Paratenetus Spinola, 1845, Prateus, Terametus Motschulsky, 1869, and Tithassa Pascoe, 1860. Lorelus Sharp, 1876 is Returned to Synonymy with Prateus, resulting in the following 49 New Combinations: Prateus angulatus (Doyen & Poinar, 1994), P. angustulus (Champion, 1913), P. armatus (Montrouzier, 1860), P. biroi (Kaszab, 1956), P. blairi (Kaszab, 1955), P. brevicornis (Champion, 1896), P. breviusculus (Champion, 1913), P. caledonicus (Kaszab, 1982), P. carolinensis (Blair, 1940), P. chinensis (Kaszab, 1940), P. clarkei (Kulzer, 1957), P. crassicornis (Broun, 1880), P. crassepunctatus (Kaszab, 1982), P. cribricollis (Kaszab, 1940), P. curvipes (Champion, 1913), P. dybasi (Kulzer, 1957), P. fijianus (Kaszab, 1982), P. fumatus (Lea, 1929), P. glabriventris (Kaszab, 1982), P. greensladei (Kaszab, 1982), P. guadeloupensis (Kaszab, 1940), P. hirtus (Kaszab, 1982), P. ivoirensis (Ardoin, 1969), P. kanak (Kaszab, 1986), P. kaszabi (Watt, 1992), P. laticornis (Watt, 1992), P. latulus (Broun, 1910), P. longicornis (Kaszab, 1982), P. mareensis (Kaszab, 1982), P. marginalis (Broun, 1910), P. niger (Kaszab, 1982), P. norfolkianus (Kaszab, 1982), P. obtusus (Watt, 1992), P. ocularis (Fauvel, 1904), P. opacus (Watt, 1992), P. palauensis (Kulzer, 1957), P. politus (Watt, 1992), P. priscus (Sharp, 1876), P. prosternalis (Kaszab, 1982), P. pubescens (Broun, 1880), P. pubipennis (Lea, 1929), P. punctatus (Watt, 1992), P. quadricollis (Broun, 1886), P. queenslandicus (Kaszab, 1986), P. rugifrons (Champion, 1913), P. solomonis (Kaszab, 1982), P. tarsalis (Broun, 1910), P. unicornis (Kaszab, 1982), and P. watti (Kaszab, 1982). Microlyprops Kaszab, 1939 is placed as a New Synonym of Micropedinus resulting in the following New Combinations: Micropedinus ceylonicus (Kaszab, 1939) and M. maderi (Kaszab, 1940). Lorelopsis Revised Status is revalidated as a genus and eight species formerly in Lorelus are transferred to it resulting in the following six New Combinations: Lorelopsis bicolor (Doyen, 1993), L. glabrata (Doyen, 1993), L. exilis (Champion, 1913), L. foraminosa (Doyen & Poinar, 1994), L. minutulis (Doyen & Poinar, 1994), L. trapezidera (Champion, 1913), and L. wolcotti (Doyen, 1993). Lorelopsis pilosa Champion, 1896 becomes a Restored Combination. In Goniaderini, Aemymone Bates, 1868 Revised Status and Opatresthes Gebien, 1928 Revised Status, which were recently considered as subgenera of Goniadera Perty, 1832, are restored as valid genera based on new character analysis resulting in the following New Combinations: Aemymone hansfranzi (Ferrer & Delatour, 2007), A. simplex (Fairmaire, 1889), A. striatipennis (Pic, 1934) and Restored Combinations: Aemymone cariosa (Bates, 1868), A. crenata Champion, 1893, and A. semirufa Pic, 1917. Gamaxus Bates, 1868 is Returned to Synonymy with Phymatestes Pascoe, 1866, and the type species Gamaxus hauxwelli Bates, 1868 is placed as a New Synonym of Phymatestes brevicornis (Lacordaire, 1859). The following seven genera are placed as New Synonyms of Anaedus Blanchard, 1842: Microanaedus Pic, 1923, Pengaleganus Pic, 1917, Pseudanaedus Gebien, 1921, Pseudolyprops Fairmaire, 1882, Spinolyprops Pic, 1917, Spinadaenus Pic, 1921, and Sphingocorse Gebien, 1921. Fourteen species described by Pic in Aspisoma Duponchel & Chevrolat, 1841 (not Aspisoma Laporte, 1833) are returned to Tenebrionidae as valid species of Anaedus. These synonymies necessitate the following 51 New Combinations: Anaedus albipes (Gebien, 1921), A. amboinensis (Kaszab, 1964), A. amplicollis (Fairmaire, 1896), A. anaedoides (Gebien, 1921), A. angulicollis (Gebien, 1921), A. angustatus (Pic, 1921), A. australiae (Carter, 1930), A. bartolozzii (Ferrer, 2002), A. beloni Fairmaire, 1888), A. biangulatus (Gebien, 1921), A. borneensis (Pic, 1917), A. carinicollis (Gebien, 1921), A. conradti (Gebien, 1921), A. cribricollis (Schawaller, 2012), A. gabonicus (Pic, 1917), A. himalayicus (Kaszab, 1965), A. inaequalis (Pic, 1917), A. jacobsoni (Gebien, 1927), A. lateralis (Pic, 1917), A. latus (Pic, 1917), A. longeplicatus (Gebien, 1921) , A. maculipennis (Schawaller, 2011), A. major (Pic, 1917), A. nepalicus (Kaszab, 1975), A. nigrita (Gebien, 1927), A. notatus (Pic, 1923), A. pakistanicus (Schawaller, 1996), A. pinguis (Gebien, 1927), A. punctatus (Carter, 1914), A. raffrayi (Pic, 1917), A. rufithorax (Pic, 1917), A. rufus (Pic, 1917), A. serrimargo (Gebien, 1914), A. sumatrensis (Pic, 1917), A. terminatus (Gebien, 1921), A. testaceicornis (Pic, 1921), A. testaceipes (Pic, 1917), A. thailandicus (Schawaller, 2012), A. trautneri (Schawaller, 1994); and 13 restored combinations: Anaedus boliviensis (Pic, 1934), A. claveri (Pic, 1917), A. diversicollis (Pic, 1917), A. elongatus (Pic, 1934), A. guyanensis (Pic, 1917), A. holtzi (Pic, 1934), A. inangulatus (Pic, 1934), A. inhumeralis (Pic, 1917), A. mendesensis (Pic, 1917), A. minutus (Pic, 1917), A. rufimembris (Pic, 1932), A. rufipennis (Pic, 1917), A. subelongatus (Pic, 1932). The new synonymies with Anaedus necessitate the following six New Replacement Names Anaedus maculipennis (for Spinolyprops maculatus Kulzer, 1954), A. grimmi (for Aspisoma forticornis Pic, 1917), A. minimus (for Anaedus minutus Pic, 1938), A. merkli (for Anaedus diversicollis Pic, 1938), A. ottomerkli (for Anaedus lateralis Pic, 1923), A. schawalleri (for Anaedus nepalicus Schawaller, 1994). Capeluprops Schawaller, 2011 is removed from Lupropini and provisionally placed in Laenini Seidlitz, 1895. Plastica Waterhouse, 1903 is transferred from Apocryphini Lacordaire, 1859 to Laenini. Paralorelopsis Marcuzzi, 1994 is removed from Lupropini and provisionally placed in Lagriinae incertae sedis. Pseudesarcus Champion, 1913 is transferred from Lagriinae incertae sedis to Diaperinae incertae sedis. Falsotithassa Pic, 1934 is transferred from Lupropini to Leiochrinini Lewis, 1894 (Diaperinae). Mimocellus Wasmann, 1904 is transferred from Lupropini to Tenebrionidae incertae sedis, and likely belongs in either Diaperinae or Stenochiinae.

The State of Arizona in the south-western United States supports a high diversity of insects. Digitised occurrence records, especially from preserved specimens in natural history collections, are an important and growing resource to understand biodiversity and biogeography. Underlying bias in how insects are collected and what that means for interpreting patterns of insect diversity is largely untested. To explore the effects of insect collecting bias in Arizona, the State was regionalised into specific areas. First, the entire State was divided into broad biogeographic areas by ecoregion. Second, the 81 tallest mountain ranges were mapped on to the State. The distribution of digitised records across these areas were then examined.A case study of surveying the beetles (Insecta, Coleoptera) of the Sand Tank Mountains is presented. The Sand Tanks are a low-elevation range in the Lower Colorado River Basin subregion of the Sonoran Desert from which a single beetle record was published before this study.The number of occurrence records and collecting events are very unevenly distributed throughout Arizona and do not strongly correlate with the geographic size of areas. Species richness is estimated for regions in Arizona using rarefaction and extrapolation. Digitised records from the disproportionately highly collected areas in Arizona represent at best 70% the total insect diversity within them. We report a total of 141 species of Coleoptera from the Sand Tank Mountains, based on 914 digitised voucher specimens. These specimens add important new records for taxa that were previously unavailable in digitised data and highlight important biogeographic ranges.Possible underlying mechanisms causing bias are discussed and recommendations are made for future targeted collecting of under-sampled regions. Insect species diversity is apparently at best 70% documented for the State of Arizona with many thousands of species not yet recorded. The Chiricahua Mountains are the most densely sampled region of Arizona and likely contain at least 2,000 species not yet vouchered in online data. Preliminary estimates for species richness of Arizona are at least 21,000 and likely much higher. Limitations to analyses are discussed which highlight the strong need for more insect occurrence data.

Tenebrionidae is one of the most diverse families in Coleoptera. However, research on the family in Colombia is limited. Based on a comprehensive literature review, a list of tenebrionid species known from the country was compiled and the state of knowledge is analyzed. Based on this information, the Ten-ebrionidae in Colombia are represented by 326 species, organized into 95 genera (seven subgenera), 30 tribes, and nine subfamilies. Cundinamarca, including Bogotá, presents the highest number of recorded species with 52, followed by Valle del Cauca with sixteen, and Bolívar with thirteen; eight departments have records for only a single species, and ten do not have records of any tenebrionid species. Potential reasons for the historically limited research on Colombian tenebrionids are discussed and actions to reduce these knowledge gaps are proposed.

The beetle fauna of the California Channel Islands is here enumerated for the first time in over 120 years. We provide an annotated checklist documenting species-by-island diversity from an exhaustive literature review and analysis of a compiled dataset of 26,609 digitized specimen records to which were added over 3,000 individual specimen determinations. We report 825 unique species from 514 genera and 71 families (including 17 new family records) comprising 1,829 species-by-island records. Species totals for each island are as follows: Anacapa (74); San Clemente (197); San Miguel (138); San Nicolas (146); Santa Barbara (64); Santa Catalina (370); Santa Cruz (503); and Santa Rosa (337). This represents the largest list of species published to date for any taxonomic group of animals on the Channel Islands; despite this, we consider the checklist to be preliminary. We present evidence that both inventory and taxonomic efforts on Channel Islands beetles are far from complete. Rarefaction estimates indicate there are at least several hundred more species of beetles yet to be recorded from the islands. Despite the incomplete nature of existing records, we found that species diversity is highly correlated with island area. We report 56 species which are putatively geographically restricted (endemic) to the Channel Islands, with two additional species of questionable endemic status. We also report 52 species from the islands which do not natively occur in the southern California region.

Generating regional checklists for insects is frequently based on combining data sources ranging from literature and expert assertions that merely imply the existence of an occurrence to aggregated, standard-compliant data of uniquely identified specimens. The increasing diversity of data sources also means that checklist authors are faced with new responsibilities, effectively acting as filterers to select and utilize an expert-validated subset of all available data. Authors are also faced with the technical obstacle to bring more occurrences into Darwin Core-based data aggregation, even if the corresponding specimens belong to external institutions. We illustrate these issues based on a partial update of the Kimsey et al. 2017 checklist of darkling beetles - Tenebrionidae sec. Bousquet et al. 2018 - inhabiting the Algodones Dunes of California. Our update entails 54 species-level concepts for this group and region, of which 31 concepts were found to be represented in three specimen-data aggregator portals, based on our interpretations of the aggregators' data. We reassess the distributions and biogeographic affinities of these species, focusing on taxa that are precinctive (highly geographically restricted) to the Lower Colorado River Valley in the context of recent dune formation from the Colorado River. Throughout, we apply taxonomic concept labels (taxonomic name according to source) to contextualize preferred name usages, but also show that the identification data of aggregated occurrences are very rarely well-contextualized or annotated. Doing so is a pre-requisite for publishing open, dynamic checklist versions that finely accredit incremental expert efforts spent to improve the quality of checklists and aggregated occurrence data.

This catalogue includes all valid family-group (8 subfamilies, 52 tribes, 14 subtribes), genus-group (349 genera, 86 subgenera), and species-group names (2825 species, 215 subspecies) of darkling beetles (Coleoptera: Tenebrionidae) known to occur in North America1 and their available synonyms. Data on extant, subfossil and fossil taxa are given. For each name the author and year and page number of the description are provided, with additional information (e.g., type species for genus-group names, author of synonymies for invalid taxa) depending on the taxon rank. Several new nomenclatural acts are included. One new genus, Lepidocnemeplatia Bousquet and Bouchard, is described. Spelaebiosis Bousquet and Bouchard [for Ardoinia Özdikmen, 2004], Blapstinus marcuzzii Aalbu [for Blapstinus kulzeri Marcuzzi, 1977], and Hymenorus campbelli Bouchard [for Hymenorus oculatus Doyen and Poinar, 1994] are proposed as new replacement names. Supporting evidence is provided for the conservation of usage of Tarpela micans (Fabricius, 1798) nomen protectum over Tarpela vittata (Olivier, 1793) nomen oblitum. The generic names Psilomera Motschulsky, 1870 [= Stenomorpha Solier, 1836], Steneleodes Blaisdell, 1909 [= Xysta Eschscholtz, 1829], Ooconibius Casey, 1895 and Euconibius Casey, 1895 [= Conibius LeConte, 1851] are new synonyms (valid names in square brackets). The following 127 new synonymies of species-group names, listed in their original combination, are proposed (valid names, in their current combination, placed in square brackets): Bothrasida mucorea Wilke, 1922 [= Pelecyphorus guanajuatensis (Champion, 1884)]; Parasida zacualpanicola Wilke, 1922 [= Pelecyphorus asidoides Solier, 1836]; Stenosides kulzeri Pallister, 1954, Stenosides bisinuatus Pallister, 1954, and Parasida trisinuata Pallister, 1954 [= Pelecyphorus dispar (Champion, 1892)]; Asida favosa Champion, 1884 and Asida similata Champion, 1884 [= Pelecyphorus fallax (Champion, 1884)]; Ologlyptus bicarinatus Champion, 1884 [= Pelecyphorus indutus (Champion, 1884)]; Parasida laciniata Casey, 1912 and Parasida cristata Pallister, 1954 [= Pelecyphorus liratus (LeConte, 1854)]; Parasida esperanzae Wilke, 1922 and Parasida mixtecae Wilke, 1922 [= Pelecyphorus longipennis (Champion, 1884)]; Parasida tolucana Casey, 1912 [= Pelecyphorus scutellaris (Champion, 1884)]; Parasida purpusi Wilke, 1922 [= Pelecyphorus tristis (Champion, 1884)]; Astrotus nosodermoides Champion, 1892 [= Pelecyphorus erosus (Champion, 1892)]; Astrotus seticornis var. humeralis Champion, 1884 [= Pelecyphorus seticornis (Champion, 1884)]; Pactostoma breviuscula Casey, 1912, Pactostoma exoleta Casey, 1912, Pactostoma luteotecta Casey, 1912, Pactostoma monticola Casey, 1912, Pactostoma obtecta Casey, 1912, and Pactostoma sigillata Casey, 1912 [=Pelecyphorus anastomosis (Say, 1824)]; Ologlyptus canus Champion, 1884 and Ologlyptus sinuaticollis Champion, 1884 [= Pelecyphorus graciliformis (Solier, 1836)]; Gonasida elata reducta Casey, 1912, Gonasida elata prolixa Casey, 1912, and Gonasida aucta Casey, 1912 [= Philolithus elatus compar (Casey, 1912)]; Gonasida alaticollis Casey, 1912 [= Philolithus elatus difformis (LeConte, 1854)]; Gonasida gravida Casey, 1912 [= Philolithus elatus elatus (LeConte, 1853)]; Pelecyphorus aegrotus limbatus Casey, 1912 [= Philolithus aegrotus aegrotus (LeConte, 1861)]; Pelecyphorus corporalis Casey, 1912, Pelecyphorus reptans Casey, 1912, Pelecyphorus socer Casey, 1912, Pelecyphorus abscissus Casey, 1912, Pelecyphorus fumosus Casey, 1912, Pelecyphorus parvus Casey, 1912, Pelecyphorus morbillosus pacatus Casey, 1912, Pelecyphorus morbillosus sobrius Casey, 1912, Pelecyphorus piceus Casey, 1912, Pelecyphorus piceus crudelis Casey, 1912, Pelecyphorus snowi Casey, 1912, and Pelecyphorus subtenuis Casey, 1912 [= Philolithus morbillosus (LeConte, 1858)]; Bothrasida sanctae-agnae Wilke, 1922 [= Stenomorpha funesta (Champion, 1884)]; Asida flaccida Horn, 1896 [= Stenomorpha embaphionides (Horn, 1894)]; Asida angustula Casey, 1890, Stethasida stricta Casey, 1912, Stethasida muricatula languida Casey, 1912, Stethasida pertinax Casey, 1912, Stethasida socors Casey, 1912, Stethasida angustula inepta Casey, 1912, Stethasida tenax Casey, 1912, and Stethasida vegrandis Casey, 1912 [= Stenomorpha muricatula (LeConte, 1851)]; Stethasida obsoleta expansa Casey, 1912, Stethasida obsoleta opacella Casey, 1912, Stethasida brevipes Casey, 1912, Stethasida torpida Casey, 1912, Stethasida convergens Casey, 1912, Stethasida discreta Casey, 1912, Stethasida longula Casey, 1912, Stethasida adumbrata Casey, 1912, Stethasida occulta Casey, 1912, Stethasida tarsalis Casey, 1912, Stethasida unica Casey, 1912, and Pelecyphorus laevigatus Papp, 1961 [= Stenomorpha obsoleta (LeConte, 1851)]; Trichiasida eremica Wilke, 1922 [= Stenomorpha difficilis (Champion, 1884)]; Trichiasida lineatopilosa Casey, 1912 [= Stenomorpha hirsuta (LeConte, 1851)]; Trichiasida tenella Casey, 1912 [= Stenomorpha hispidula (LeConte, 1851)]; Trichiasida duplex Casey, 1912 [= Stenomorpha villosa (Champion, 1884)]; Alaudes squamosa Blaisdell, 1919, Alaudes testacea Blaisdell, 1919, and Alaudes fallax Fall, 1928 [= Alaudes singularis Horn, 1870]; Edrotes barrowsi Dajoz, 1999 [=Edrotes ventricosus LeConte, 1851]; Nyctoporis tetrica Casey, 1907 and Nyctoporis maura Casey, 1907 [= Nyctoporis aequicollis Eschscholtz, 1831]; Nyctoporis pullata Casey, 1907 [= Nyctoporis sponsa Casey, 1907]; Eleodes tibialis forma oblonga Blaisdell, 1909 [= Eleodes tibialis Blaisdell, 1909]; Eleodes (manni var.) variolosa Blaisdell, 1917 [= Eleodes constrictus LeConte, 1858]; Eleodes cordata forma sublaevis Blaisdell, 1909, Eleodes cordata forma intermedia Blaisdell, 1909, Eleodes cordata forma oblonga Blaisdell, 1909, Eleodes cordata forma elongata Blaisdell, 1909, and Eleodes (cordata var.) adulterina Blaisdell, 1917 [= Eleodes cordata Eschscholtz, 1829]; Eleodes hornii var. monticula Blaisdell, 1918 and Eleodes manni sierra Blaisdell, 1925 [= Eleodes fuchsii Blaisdell, 1909]; Eleodes parvicollis var. squalida Blaisdell, 1918 [= Eleodes parvicollis Eschscholtz, 1829]; Eleodes reflexicollis Mannerheim, 1843 and Eleodes parvicollis forma farallonica Blaisdell, 1909 [= Eleodes planata Eschscholtz, 1829]; Eleodes indentata Blaisdell, 1935 [= Eleodes rotundipennis LeConte, 1857]; Eleodes intricata Mannerheim, 1843 [= Eleodes scabrosa Eschscholtz, 1829]; Eleodes horni fenyesi Blaisdell, 1925 [= Eleodes tenebrosa Horn, 1870]; Eleodes cordata var. horrida Blaisdell, 1918 [= Eleodes tuberculata Eschscholtz, 1829]; Eleodes oblonga Blaisdell, 1933 [= Eleodes versatilis Blaisdell, 1921]; Eleodes dentipes marinae Blaisdell, 1921 [= Eleodes dentipes Eschscholtz, 1829]; Eleodes carbonaria forma glabra Blaisdell, 1909 [= Eleodes carbonaria carbonaria (Say, 1824)]; Eleodes granosa forma fortis Blaisdell, 1909 [= Eleodes granosa LeConte, 1866]; Eleodes pilosa forma ordinata Blaisdell, 1909 [= Eleodes pilosa Horn, 1870]; Trogloderus costatus pappi Kulzer, 1960 [= Trogloderus tuberculatus Blaisdell, 1909]; Trogloderus costatus mayhewi Papp, 1961 [= Trogloderus vandykei La Rivers, 1946]; Bolitophagus cristatus Gosse, 1840 [= Bolitotherus cornutus (Fabricius, 1801)]; Eleates explanatus Casey, 1890 [= Eleates depressus (Randall, 1838)]; Blapstinus sonorae Casey, 1890 [= Blapstinus brevicollis LeConte, 1851]; Blapstinus falli Blaisdell, 1929 [= Blapstinus castaneus Casey, 1890]; Blapstinus brunneus Casey, 1890 and Blapstinus coronadensis Blaisdell, 1892 [=Blapstinus histricus Casey, 1890]; Blapstinus hesperius Casey, 1890 [=Blapstinus intermixtus Casey, 1890]; Blapstinus cinerascens Fall, 1929 [= Blapstinus lecontei Mulsant and Rey, 1859]; Blapstinus niger Casey, 1890 and Blapstinus cribricollis Casey, 1890 [= Blapstinus pimalis Casey, 1885]; Blapstinus arenarius Casey, 1890 [= Blapstinus pratensis LeConte, 1859]; Blapstinus gregalis Casey, 1890 [= Blapstinus substriatus Champion, 1885]; Blapstinus hydropicus Casey, 1890 [= Blapstinus sulcatus LeConte, 1851]; Blapstinus hospes Casey, 1890 [= Blapstinus vestitus LeConte, 1859]; Notibius reflexus Horn, 1894 [= Conibius opacus (LeConte, 1866)]; Notibius affinis Champion, 1885 [=Conibius rugipes (Champion, 1885)]; Conibius parallelus LeConte, 1851 [= Conibius seriatus LeConte, 1851]; Nocibiotes rubripes Casey, 1895 [=Nocibiotes caudatus Casey, 1895]; Nocibiotes gracilis Casey, 1895 and Nocibiotes acutus Casey, 1895 [=Nocibiotes granulatus (LeConte, 1851)]; Conibius alternatus Casey, 1890 [= Tonibius sulcatus (LeConte, 1851)]; Pedinus suturalis Say, 1824 [= Alaetrinus minimus (Palisot de Beauvois, 1817)]; Menedrio longipennis Motschulsky, 1872 [= Tenebrio obscurus Fabricius, 1792]; Hymenophorus megops Hatch, 1965 and Telesicles magnus Hatch, 1965 [= Hymenorus sinuatus Fall, 1931]; Andrimus concolor Casey, 1891 and Andrimus convergens Casey, 1891 [= Andrimus murrayi (LeConte, 1866)]; Mycetochara marshalli Campbell, 1978 [= Mycetochara perplexata Marshall, 1970]; Phaleria globosa LeConte, 1857 [= Phaleria picta Mannerheim, 1843]. The following subspecies of Trogloderus costatus LeConte, 1879 are given species rank: Trogloderus nevadus La Rivers, 1943, Trogloderus tuberculatus Blaisdell, 1909, and Trogloderus vandykei La Rivers, 1946. The following taxa, previously thought to be junior synonyms, are considered valid: Amphidora Eschscholtz, 1829; Xysta Eschscholtz, 1829; Helops confluens (Casey, 1924). Two new combinations are proposed: Stenomorpha spinimana (Champion, 1892) and Stenomorpha tenebrosa (Champion, 1892) [from the genus Parasida Casey, 1912]. The type species [placed in square brackets] of the following 12 genus-group taxa are designated for the first time: Lagriola Kirsch, 1874 [Lagriola operosa Kirsch, 1874]; Locrodes Casey, 1907 [Emmenastus piceus Casey, 1890]; Falacer Laporte, 1840 [Acanthopus cupreus Laporte, 1840 (= Helops contractus Palisot de Beauvois, 1812)]; Blapylis Horn, 1870 [Eleodes cordata Eschscholtz, 1829]; Discogenia LeConte, 1866 [Eleodes scabricula LeConte, 1858]; Metablapylis Blaisdell, 1909 [Eleodes nigrina LeConte, 1858]; Steneleodes Blaisdell, 1909 [Eleodes longicollis LeConte, 1851]; Scaptes Champion, 1886 [Scaptes squamulatus Champion, 1886 (= Asida tropica Kirsch, 1866)]; Aspidius Mulsant and Rey, 1859 [Blaps punctata Fabricius, 1792]; Cryptozoon Schaufuss, 1882 [Cryptozoon civile Schaufuss, 1882]; Halophalerus Crotch, 1874 [Phaleria rotundata LeConte, 1851]; Dignamptus LeConte, 1878 [Dignamptus stenochinus LeConte, 1878]. Two species previously known from South America [Nilio lebasi J. Thomson and Platydema erotyloides Chevrolat] are reported for the first time from North America.

The genus Trogloderus LeConte, 1879, which is restricted to dunes and sandy habitats in the western United States, is revised using morphological and molecular information. Six new species are described from desert regions: Trogloderus arcanus New Species (Lahontan Trough); Trogloderus kandai New Species (Owens Valley); Trogloderus major New Species (Mohave Desert); Trogloderus skillmani New Species (eastern Great Basin and Mohave Desert); Trogloderus verpus New Species (eastern Colorado Plateau); and Trogloderus warneri New Species (western Colorado Plateau). A molecular phylogeny is presented for the genus and used to infer its historical biogeography. The most recent common ancestor of Trogloderus is dated to 5.2 mya and is inferred to have inhabited the Colorado Plateau. Current species most likely arose during the mid-Pleistocene where the geographic features of the Lahontan Trough, Bouse Embayment and Kaibab Plateau were significant factors driving speciation.

Two major lineages of beetles inhabit cycad cones in the New World: weevils (Curculionoidea) in the subtribe Allocorynina, including the genera Notorhopalotria Tang and O’Brien, Parallocorynus Voss, Protocorynus O’Brien and Tang and Rhopalotria Chevrolat, and beetles in the family Erotylidae, including the genus Pharaxonotha Reitter. Analysis of the 16S ribosomal RNA (rRNA) mitochondrial gene as well as cladistic analysis of morphological characters of the weevils indicate four major radiations, with a probable origin on the cycad genus Dioon Lindl. and comparatively recent host shifts onto Zamia L. Analysis of the 16S rRNA gene for erotylid beetles indicates that an undescribed genus restricted to New World Ceratozamia Brongn. is the most early-diverging clade, and this lineage is sister to a large radiation of the genus Pharaxonotha onto Zamia, with apparent host shifts onto Dioon and Ceratozamia. Analysis of beetles are in accord with current models of continental drift in the Caribbean basin, support some proposed species groupings of cycads, but not others, and suggest that pollinator type may impact population genetic structure in their host cycads.