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First North American records are presented for Cryptocephalus moraei (Linnaeus, 1758) (Coleoptera: Cryptocephalinae) and Psylliodes dulcamarae (Koch, 1803) (Coleoptera: Galerucinae: Alticini), as confirmed by morphology and DNA barcoding. Additional information is presented about phenology and host use for C. moraei, the first European Cryptocephalinae to be found elsewhere as conclusively adventive. Cryptocephalus moraei is expected to have no ecological impact on its host, the adventive Hypericum perforatum Linnaeus (Hypericaceae). However, P. dulcamarae, the second recently discovered flea beetle associated with the adventive Solanum dulcamara Linnaeus (Solanaceae), probably does harm that host. Both species are hypothesised to have arrived from Europe with woody plant material imported with soil during 1960–1965. A literature review of introduced Chrysomelidae found that Canada and the United States of America are together home to 68–78 species of adventive Chrysomelidae. All non-Bruchinae species among these are both native to Europe and occur either in Canada or both Canada and United States of America, except for intentionally introduced biological control agents and two species that feed on Eucalyptus L’Héritier de Brutelle (Myrtaceae). This suggests a dominant role of accidental introductions of cool-climate European species in recent unplanned additions to the fauna of leaf-feeding Chrysomelidae in North America.

The Canadian Entomologist and its associated publications (Supplements of The Canadian Entomologist and Memoirs of the Entomological Society of Canada) have served as important outlets for taxonomic contributions on arthropods since 1868. A survey of beetle (Coleoptera) publications therein has revealed that 2276 species-group, 136 genus-group, and seven family-group taxa were first described in 492 scientific articles. New beetles were described in 67 families by 165 authors. We document trends of beetle descriptions over time, by taxonomic group and by the origin of the new taxa. We also provide biographical notices of the entomologists who described the new taxa. We believe that The Canadian Entomologist will continue to be coveted as a suitable outlet for taxonomic works in the future.

Cardiophorus carinatus Mathison and Douglas sp. nov. (Coleoptera: Elateridae) is described from the Lake Wales Ridge ecosystem of Florida, USA. In addition, C. robustus LeConte, 1853, is rediscovered in North America from Massachusetts, Maine, and Rhode Island.

Elateridae represents one of the largest families within Coleoptera, yet their interrelationships remain under-investigated. Molecular data are missing for most lineages, especially for the species-poor suprageneric taxa. In this study, we investigated the limits and phylogenetic position of Pityobiinae sensu Calder (1996), a group of several small genera from the New World and Australasia, using maximum likelihood and Bayesian inference methods. We merged new sequence data with those deposited in GenBank, producing a final matrix of 178 terminal taxa and covering the main click-beetle subfamilies. The resulting topologies showed Elaterinae as sister to remaining click-beetle lineages, and Agrypninae as sister to the Morostomatinae + Dendrometrinae + Cardiophorinae + Negastriinae clade. Members of Hemiopinae, Lissominae, Thylacosterninae and Pityobiinae formed basal lineages within Elateridae − Elaterinae. We found Lissominae to be polyphyletic, including Thylacosterninae as a terminal lineage and with Oestodini forming an independent lineage outside that clade. Therefore, the subfamily Oestodinae stat. nov. was reinstated for the North American genera Oestodes LeConte and Bladus LeConte. The Australian genera Dicteniophorus Candeze, Drymelater Calder and Stichotomus Candeze were transferred from Dendrometrinae to Elaterinae. Pityobiinae was recovered as two distant lineages in all analyses and correspondingly the subfamily is reduced to contain only the North American Pityobius LeConte and tentatively the South American Tibionema Solier, for which we have no DNA sequences. Additionally, we propose Parablacinae subfam. nov. for the remaining former pityobiine genera from Australia and New Zealand. The new subfamily includes Parablax Schwarz, Metablax Candeze, Wynarka Calder, Xuthelater Calder, Tasmanelater Calder, Parasaphes Candeze and also Ophidius Candeze, which is transferred here from Elaterinae. We failed to find universally diagnostic synapomorphies in adult morphology for Parablacinae, a common problem in elaterid taxonomy. Future research, including a comprehensive phylogeny of the subfamily and re-examination of the morphology of its species is crucial to understanding the limits and classification of this lineage.

The formerly monotypic genus Blaiseus, known from Vietnam, is redescribed and nine new species are described and illustrated: B. fujianus new species (P.R. China), B. daklakensis new species (Vietnam), B. laoensis new species (Laos), B. malayensis new species (Malaysia), B. nothoafricanus new species (South Africa), B. zamoranoensis new species (Honduras), B. guatemalensis new species (Guatemala), and B. chiapasensis new species and B. mexicanus new species from Mexico. Morphological character states of the protibia, hind wing and aedeagus not previously observed in Elateridae are described and illustrated. A female specimen of Blaiseus (B. zamoranoensis) is first described here and displays a fossorial morphology type with reduced wings and eyes. Blaiseus is hypothesized to be at least 20 million years old based on its known geographic distribution and apparent female flightlessness.

The name Exoeolus is reinstated for the replacement name Brounaeolus Hyslop. Two species are recognized here, one of which is new to science (Exoeolus brouni sp. nov.). Exoeolus obsoletus (Broun) and E. punctatus (Broun) are new junior synonyms of E. rufescens (Broun). Both recognized species are described and taxonomically important characters are presented. Distribution maps are presented. A lectotype is designated for E. rufescens, which was described from two specimens without former designation of a type.

AllCardiophorusspecies found in Canada and the United States of America east of the Rocky Mountains are keyed and all but those with the majority of their ranges west of the Rocky Mountains are revised. Eleven species are recognized, three of which are new to science (C. catskillensissp. nov.,C. destinensissp. nov., andC. panamapolissp. nov.).Cardiophorus floridaeCandèze andC. angustatusBlanchard are synonymized underC. convexus(Say). All 11 are described and taxonomically important characters are presented. Distribution maps are presented for each species. The following lectotypes are designated for species that were described from more than one specimen without former holotype designation:C. angustatus,C. floridae,C. erythropusErichson,C. gagatesErichson,C. togatusHorn,C. robustusLeConte,C. convexulusLeConte, andC. amictusMelsheimer. The following neotypes were designated to replace destroyed type specimens:C. cardisce(Say) andC. convexus.