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A new species, Epeorus (Caucasiron) hyrcanicussp. nov., is described based on larval morphology and molecular data (COI) containing sequences from all Caucasian Caucasiron species described to date. The species is distributed in the Hyrcanian forest of southeastern Azerbaijan and northwestern Iran. Based on our wide-range sampling, the new species is likely endemic to this area. The most pronounced larval morphological diagnostic characters are the coloration pattern of abdominal sterna (a pair of oblique stripes and stripe-like medio-lateral maculae) and terga (triangular medial maculae), poorly developed projection of the costal margin of gill plates III, presence of hair-like setae on the surface of abdominal terga, and relatively wide shape of gill plates VII (in natural position from ventral view). The diagnostic characters are compared to related species, and primary information to habitat is provided.

Records of 46 Psychodidae (Sycoracinae 1, Trichomyiinae 1, Psychodinae 44) species/subspecies are presented in this paper based on specimens collected by sweep-netting in Azerbaijan and Georgia in 2019. Nine species are recorded for the first time since their original description; 12 species are new for Transcaucasia; 22 species are new for Azerbaijan; and 17 species are new for Georgia. Saraiella ressli montana Ježek, 1990 is proposed as a synonym of S. ressli Wagner, 1983, syn. nov. Knowledge of some aspects of the ecology and biogeography of selected (especially rare) species has been expanded and a clear pattern was found in species richness, rare species, and new records in relation to land use, habitat diversity, and preservation of the environment surrounding the sampling site.

The available keys for European Hippoboscidae are outdated and do not cover all species currently known from Europe. Therefore, identification keys to the eleven genera and 31 species of the European hippoboscids are provided here. Ornithomya comosa (Austen, 1930) (Diptera: Hippoboscidae) is recorded for the first time from the territory of Slovakia based on one female found on a sand martin, Riparia riparia (Linnaeus, 1758). The list of keds and louse flies recorded from the territory of Slovakia is increased to 20 species. New host records for Slovakia are presented.

Psychodid specimens from one of the world’s biodiversity hotspots – the Caucasus region – were sorted from samples collected during field work in 2019. Pneumia fuehzulii sp. nov. (from two localities in Azerbaijan) and Thornburghiella salihi sp. nov. (from one locality in Azerbaijan and four sites in Georgia) are described from this material. Differential diagnoses are given and some morphological characters illustrated. Sijaricia Krek, 1999, syn. nov. of Thornburghiella Vaillant, 1982 is proposed and T. erinacea (Krek, 1971) comb. nov. from Ulomyia Walker, 1856 is suggested.

A lectotype (male) and paralectotypes (male, female) of Pneumia vittata (Tonnoir, 1919) comb. nov. (= Pericoma crispi Freeman, 1953 syn. nov.) from Belgium are designated. The species is redescribed and illustrated, and a differential diagnosis is given. The former designation of a holotype, paratypes and paratypoids by Jung is invalid because it was not published. In addition, a problem with Tonnoiriella obtusa (Tonnoir, 1919) comb. nov. (= Tonnoiriella anchoriformis Salamanna, 1975 syn. nov.) from Belgium is resolved. A female specimen is designated as a lectotype, but only the dissected wings from this specimen are in condition suitable for redescription. There is additional non-type material collected later by Tonnoir; this material, including 3 females and 1 male, was the basis for redescription, illustrations and differential diagnosis. The unpublished male lectotype designated by Jung is invalid. Two species are added to the last checklist of Psychodidae from Belgium, raising the total number to 94.

Ukraine is on the invasion front of spotted-wing Drosophila suzuki (Matsumura, 1931) spreading in Europe. Despite this globally important pest was confirmed only on the southernmost tip of its territory, recently published species distribution models expect its occurrence also in other Ukrainian regions. Therefore, we conducted two-year monitoring (2018-2019) during the whole fruit ripening season; samples were collected on the whole Ukrainian territory; standard bait traps and active capture by an insect net were employed. Individuals of the species were recorded only at the end of the vegetation season (August–October) and only in the westernmost part of Ukraine (Transcarpathian region); in the region predicted by recent ecological niche modeling. The late occurrence of D. suzuki probably reflects the presence of suitable food/fruit for the larvae at the end of the growing season. Our results confirm the importance of monitoring of this pest, together with the investigation of factors that may affect its invasion.

New and interesting records of 60 Diptera species in ten families, namely Anisopodidae, Blephariceridae, Campichoetidae, Dixidae, Drosophilidae, Limoniidae, Lonchopteridae, Pediciidae, Psychodidae and Scatopsidae, are presented in this paper based on the specimens collected in Azerbaijan and Georgia. A total of 26 species are recorded for the first time for Transcaucasia, 32 species for Azerbaijan, and 33 species for Georgia. In addition, the first or updated checklists of the above ten families are given for these countries.

The list of all known locality and host records from the literature on louse flies from Slovakia are summarized, with the addition of new collection data. New locality data are provided for five species. Three species are added to the Slovakian list: Icostaminor (Bigot in Thomson, 1858), which was erroneously cited for Moravia instead of Slovakia in the previous checklist, and Ornithophilametallica (Schiner, 1864) and Ornithomyachloropus (Bergroth, 1901), which were overlooked from the last checklist. As a result, the louse fly fauna of Slovakia increases to 19 species: 12 autochtonous species and seven rare, non-native species only occasionally imported to Slovakia or migrating to the country with their hosts. This is by far the largest regional fauna of Hippoboscidae in Central Europe, and matches the richest southern European faunas. In total, 78 host-parasite associations concerning 46 bird-host species from eight orders and nine species of mammals, including humans, have been found from a literature review in Slovakia. Two host-parasite associations are reported from Slovakia for the first time: Ornithomyaavicularia (Linnaeus, 1758) on Prunellamodularis (Linnaeus, 1758) (Aves: Prunellidae) and Lipoptenafortisetosa Maa, 1965 on Homosapiens Linnaeus, 1758 (Mammalia: Hominidae).

Psychodid specimens were sorted from samples collected during fieldwork in areas in and around the Caucasus Mountains in 2019. Thornburghiella montana sp. nov. (from Georgia) and Pericoma inopinata sp. nov. (from Azerbaijan and Georgia) are described. Differential diagnoses are given and diagnostic characters illustrated.

Known Plecoptera data published from Azerbaijan are critically reviewed. New records of 28 species are enumerated on the basis of specimens collected between 2017 and 2019, among them 16 are new for the fauna of Azerbaijan. Nemoura irani Aubert, 1964 is new for the whole Caucasian region, Leuctra sanainica Zhiltzova, 1960 and Plesioperla sakartvella (Zhiltzova, 1956) are new for the Greater Caucasus. The female and larva of an unknown Protonemura Kempny, 1898 species, collected in the Talysh Mts, are illustrated and described under temporary name Protonemura sp. AZE-1. A new species of Protonemura, collected both in the Azerbaijan and Georgian areas of the Greater Caucasus, will be formally described in a further paper. A male Protonemura specimen was found to be infected by mermithid worms, morphological lesions are illustrated and commented; this is the second documented case of mermithid infection in stoneflies. Subspecies level identity of Azerbaijani populations of Leuctra fusca (Linnaeus, 1758) proved to be problematic, morphological characters of the specimens are illustrated. Synonymy of Isoperla caucasica Balinsky, 1950 and I. pulchra Balinsky, 1950 under I. bithynica (Kempny, 1908) is disputed, the two names are combined under I. grammatica (Poda, 1761) sensu lato.

Records of 81 Psychodidae (Sycoracinae 4 spp., Psychodinae 76 spp.) species/subspecies are presented in this paper based on specimens collected in Bulgaria. 46 species are new records for Bulgaria (Sycoracinae 3 spp., Psychodinae 43 spp.). The Psychodidae fauna of Bulgaria now comprises 99 species (Phlebotominae 5 spp., Sycoracinae 5 spp., Trichomyiinae 1 sp., and Psychodinae 88 spp.).

New and additional faunistic records for 13 species of Dolichopodidae were given from Azerbaijan and Georgia. The species richness of Azerbaijan increased to 92 taxa asSybistroma transcaucasica(Stackelberg, 1941) andThinophilus quadrimaculatusBecker, 1902 are the new records for the Azerbaijan territory.Campsicnemus marginatusLoew, 1857,Sybistroma transcaucasica(Stackelberg, 1941) andTachytrechus hamatusLoew, 1871 are recorded for the first time in Georgia and the species diversity increased to 74 taxa. and additional faunistic records for 13 species of Dolichopodidae were given from Azerbaijan and Georgia.

Traps made from PET bottles were used to assess the efficiency of four baits in terms of the number of individuals for selected Diptera families collecting in Eastern Slovak gardens in summer and autumn. Bait used in traps significantly affected the taxonomical composition of the samples obtained. Moreover, significant differences in bait efficiencies and temporal shift in bait efficiencies were confirmed for the Diptera order and for selected dipteran families. The most effective bait for baited-trap Diptera sampling was beer, followed by wine, meat, and syrup from the summer sampling season. In the autumn sampling season, the wine was most effective, followed by beer, syrup, and meat. For the family Scatopsidae wine, and for the family Platystomatidae, meat were the most effective baits. Drosophilidae were most attracted to beer in summer and to wine bait in autumn.

All credible and available published records for 17 species of moth flies known so far from Armenia (Phlebotominae 11 species, Psychodinae 6 species) and Azerbaijan (Phlebotominae 18 species) are summarized. The first records of 18 species of Psychodinae (tribes Mormiini, Paramormiini, Psychodini, Pericomaini) from Armenia and 6 new faunistic records (tribes Psychodini, Pericomaini) for the fauna of Azerbaijan are listed. The checklist of recent moth flies from Armenia includes now 35 species, and from Azerbaijan, 24 species.

All important published records for 11 moth fly species known so far from Ukraine are reviewed (Phlebotominae 10 species, Psychodinae 1 species). Occurrences of two problematic taxa, Phlebotomus (Adlerius) brevis Theodor & Mesghali, 1964 and P. (Larroussius) major major Annandale, 1910, and some synonymies are discussed. Threticus negrobovi Vaillant, 1972 must be deleted for Ukraine (misstatement). First records of 34 species of Psychodinae (tribes Mormiini, Paramormiini, Psychodini, Pericomaini) and one of Sycoracinae from Ukraine are also listed.

One new moth fly species (Diptera: Psychodidae: Psychodinae) is described and illustrated on the basis of male morphological characters: Thornburghiella veve sp. nov. was collected in the vicinity of Pambak River in the mountains of Armenia. Differential diagnoses are given for males of four additional species of Thornburghiella from Transcaucasia, Asia Minor and Central Asia.

SummaryAn inventory of species from families Brachystomatidae, Empididae and Hybotidae from random and non-intensive samplings from Uzh River Basin in the Ukraine is presented. Thirteen empidid species [Empis (E.) filata, Hemerodromia oratoria, Hilara flavipes, H. hyposeta, H. intermedia, H. lasiochira, H. litorea, H. media, Chelifera precatoria, C. trapezina, Rhamphomyia (Aclonempis) longipes, R. (Holoclera) nigripennis, Wiedemannia (W.) tricuspidata], and three hybotid species (Crossopalpus curvinervis, Oedalea stigmatella, Platypalpus longiseta) are recorded for the first time for the fauna of the Ukraine. Ukrainian checklists of these families are summarized for Brachystomatidae with two species, for Empididae with 57 species and for Hybotidae with 91 species.

First records of the following species of the family Dolichopodidae are given for Armenia: Asyndetus latifrons (Loew, 1857), Sybistroma obscurella Fallen, 1823, Hercostomus chetifer (Walker, 1849), H. vivax (Loew, 1857), Chrysotimus molliculus (Fallen, 1823), Rhaphium discigerum Stenhammar, 1851, Sympycnus pulicarius (Fallen, 1823), Teuchophorus monacanthus Loew, 1859, and Xanthochlorus tenellus (Wiedemann, 1817). The records of A. latifrons and R. discigerum represent the first ones from Transcaucasia. Campsicnemus armeniacus sp. n. is described. The first checklist of long-legged flies of Armenia is enclosed, containing 77 species (including one subspecies).

Records of species of the families Limoniidae and Pediciidae are presented from Armenia. A total of 38 species of Limoniidae and four species of Pediciidae are listed. Of these, 27 species of Limoniidae and one species of Pediciidae represent the first records from Armenia. The first checklist of these families from Armenia is appended, containing 77 species of Limoniidae and six species of Pediciidae.

The feeding habits of two different populations of Perla pallida from two different streams in Armenia are described. Among Plecoptera, Perlidae have been particularly well studied regarding their feeding habits, but the trophic behaviour of this species all along its distribution area was neglected. This is the first information on the nymphal diet of this species. The aim of the present paper is to describe the feeding habits of P. pallida nymphs, to compare the obtained results between populations from the two streams and to compare the obtained data with those known in other Perla spp. Sixty nymphs from each stream, representing all the present size range, were selected to study the trophic habits by the transparency method. The percentage of various items and the number of prey was recorded. About 60% of the 120 analyzed nymphs had some gut content. The feeding habits of the studied populations of P. pallida in Armenia widely coincide with those observed in other Perla spp. populations all around Europe. The main trophic resources ingested by nymphs of these populations were animal matter (mainly Chironomidae and Ephemeroptera), detritus and diatoms. Significant negative correlations were found between head width and percentage of detritus in both populations. While detritus is an important component of the diet in smaller nymphs, we observed a significant trend to ingest higher size prey by bigger nymphs. Differences in the trophic spectrum width and statistically significant differences between populations were detected for the importance of some resources in the guts (such as detritus, diatoms and Chironomidae). We suppose that these differences reflect the taxonomical composition and abundance of aquatic macroinvertebrates assemblage and thus the quantity and composition of available prey at sampling stations, as well as differences in the availability of detritus and diatoms.

We provide the first commented checklist of Armenian mayflies, based on all relevant literature and recent extensive sampling of 72 localities throughout Armenia during 2011, 2014, and 2015. Altogether 46 species are listed, eight of them reported from Armenia for the first time. One new species, Ecdyonurus (Ecdyonurus) eurycephalus sp. nov. is described (larva and male imago) based on morphological and molecular (COI) data. The species is characterized by a unique head shape in male imago and by the presence of tracheal filaments on gill plate VII in the larval stage.

Six non-native invasive fish species from the Slovak part of the Tisa River basin, namely Carassius gibelio, Pseudorasbora parva, Ameiurus melas, A. nebulosus, Lepomis gibbosus, Perccottus glenii, and three gobiid species from the Danube River, namely Neogobius melanostomus, N. fluviatilis and N. kessleri, were investigated for endohelminth parasites. The expanding Asian cestode Nippotaenia mogurndae (syn. Amurotaenia perccotti) (Nippotaeniidea) has been introduced to Europe with its invasive host P. glenii. Pumpkinseed, Lepomis gibbosus, is a new definitive host of Proteocephalus percae and it is reported as the second intermediate host of the bothriocephalidean cestode Triaenophorus nodulosus in Slovakia.

The scarce European dance fly Chelifera aperticauda Collin, 1927 (Diptera: Empididae: Hemer­odromiinae) is recorded for the first time from Slovakia. One male was found in the Pieniny Mts. The distribution and habitats of this species are reviewed and briefly discussed.