The genus Epeolus Latreille, 1802 (Hymenoptera, Apidae) in Central Asia.

Available information about bees of the genus Epeolus in Central Asia is summarized. Twenty species are currently known from this area. Two new species are described: E.albus Astafurova & Proshchalykin, sp. nov. and E.pesenkoi Astafurova, sp. nov. Two species are newly recorded from Central Asia: E.asiaticus Astafurova & Proshchalykin, 2022 and E.nudiventris Bischoff, 1930. The hitherto unknown male of E.mikhailovi Astafurova & Proshchalykin, 2021 is described, and lectotypes are designated for E.ruficornis Morawitz, 1875 and E.vinogradovi Popov, 1952.

The type specimens of bees (Hymenoptera: Apoidea) deposited in the Zoological Institute of the Russian Academy of Sciences, St. Petersburg. Contribution VI. Family Andrenidae, genus Andrena Fabricius, 1775, taxa described by V. Popov.

The type specimens for names of bee taxa in the genus Andrena Fabricius, 1775, described by V.B. Popov and which are deposited in the Zoological Institute, Russian Academy of Sciences (St. Petersburg) are reviewed. Primary types of 19 taxa are illustrated and detailed information is provided. New synonymies are established for Andrena chengtehensis Yasumatsu, 1935 (= A. nova Popov, 1940, syn. nov.) and A. skorikovi Popov, 1940 (=A. firuzaensis Popov, 1940, syn. nov.; =A. firuzaensis popovella Gusenleitner & Schwarz, 2002, syn. nov.; = Andrena iranella Popov, 1940, syn. nov.). Based on study of the the lectotype, we consider Andrena discophora transhissarica Popov, 1958, stat. rev., at the subspecific level, and not as a distinct species, as opposed to Shebl & Tadauchi (2011). Lectotypes are here designated for the following twelve nominal taxa: Andrena alashanica Popov, 1949, A. discophora transhissarica Popov, 1958, A. eoa Popov, 1949, A. fedtschenkoi djumensis Popov, 1947, A. firuzaensis Popov, 1940, A. iranella Popov, 1940, A. lebedevi Popov, 1940, A. nanshanica Popov, 1940, A. nova Popov, 1940, A. shakuensis Popov, 1949, A. subconsobrina Popov, 1949, and A. tadzhica Popov, 1949.

To the knowledge of the solitary vespid wasps (Hymenoptera: Vespidae: Masarinae and Eumeninae s. l.) of Uzbekistan.

The knowledge of the solitary Vespidae of Uzbekistan is very poor and a preliminary list of species is provided. The list contains 105 species of 34 genera: seven species of three genera in the subfamily Masarinae, 96 species of 29 genera in Eumeninae s. str., one species in Raphiglossinae and one in Zethinae. Among them, eight genera and 27 species are reported from Uzbekistan for the first time; their label data and general distribution are reported. New synonymies are proposed: Leptochilus (Lionotulus Blüthgen, 1938) = L. (Neoleptochilus Blüthgen, 1961), syn. nov. = L. (Sarochilus Gusenleitner, 1970), syn. nov.; Leptochilus (Lionotulus) crassiceps (Kostylev, 1940) = L. (L.) flavicornis Giordani Soika, 1970, syn. nov.; Euodynerus (Pareuodynerus) cylindriventris (Kostylev, 1935) = E. (P.) distinctus (Kostylev, 1935), syn. nov.; Eustenancistrocerus (Eustenancistrocerus) askhabadensis (Radoszkowski, 1886) = E. (E.) jerichoensis (von Schulthess, 1928), syn. nov. = E. (E.) askhabadensis danticoides (Giordani Soika, 1943), syn. nov. = E. (E.) jerichoensis iconius Blüthgen, 1957, syn. nov. The synonymy of Eumenes (Eumenes) sareptanus André, 1884 with E. (E.) crimensis Blüthgen, 1938 is rejected. A nest of Stenodynerus chitgarensis Giordani Soika, 1970 is briefly described for the first time; it consisted of a constructed mud cell, with a turret-like entrance, attached to a subvertical surface of a stone. Bionomical observations on some other species are reported including prey records for three species, flower-visiting records for nine species, a sleeping aggregation of two species, and a Strepsiptera parasite of one species.

Foraging Behavior of Two Pollen Wasp Species of the Genus Celonites Latreille, 1802 (Hymenoptera: Vespidae: Masarinae), from the Altai Mountains.

Celonites kozlovi Kostylev, 1935, and C. sibiricus Gusenleitner, 2007, coexist in semi-deserts of the Altai Mountains. The trophic relationships of these pollen wasp species to flowers are largely unknown. We observed the flower visits and behaviors of wasps on flowers; pollen-collecting structures of females were studied using SEM; the taxonomic position of these two species was ascertained with the barcoding sequence of the mitochondrial COI-5P gene. Celonites kozlovi and C. sibiricus form a clade together with C. hellenicus Gusenleitner, 1997, and C. iranus Gusenleitner, 2018, within the subgenus Eucelonites Richards, 1962. Celonites kozlovi is polylectic in the narrow sense, collecting pollen from flowers of plants belonging to five families (with the predomination of Asteraceae and Lamiaceae) using diverse methods for both pollen and nectar uptake. In addition, this species is a secondary nectar robber, which has not been observed in pollen wasps before. The generalistic foraging strategy of C. kozlovi is correlated with an unspecialized pollen-collecting apparatus on the fore-tarsi. In contrast, C. sibiricus is broadly oligolectic, predominantly collecting pollen from flowers of Lamiaceae. Its specialized foraging strategy is associated with apomorphic behavioral and morphological traits, particularly specialized pollen-collecting setae on the frons, which enable indirect pollen uptake using nototribic anthers. These adaptations in C. sibiricus evolved independently of similar specializations in the Celonites abbreviatus-complex. Celonites kozlovi is re-described, and males are described for the first time.

Lestiphorus bilunulatus yamatonis Tsuneki, 1963 (Hymenoptera, Crabronidae) raised to full species status, with description of the hitherto unknown male.

Lestiphorus yamatonis Tsuneki, 1963, stat. nov. is resurrected from synonymy and raised to full species level. The species diagnosis is updated and the hitherto unknown male is described. Illustrations of morphological details of L. yamatonis and related species are given. An updated key of the all twelve Palaearctic Lestiphorus is provided.

Corrections and additions to the catalogue of the bees (Hymenoptera, Anthophila) of Russia.

The present study is an update to the first catalogue of Russian bees published in 2017. For the Russian fauna, five recently described species are reported, as well as 45 species newly recorded since the first catalogue (including one invasive species), nine species overlooked in this previous Russian checklist, and 17 published synonymies. Original records are provided for nine species previously unknown to Russia and, as a taxonomic act, one species, Anthidiumovasi Warncke, 1980, syn. nov., is synonymised with Icteranthidiumfloripetum (Eversmann, 1852). Additionally, 14 species are excluded from the original catalogue and numerous other taxonomic changes and clarifications are included. The present work revises the total number of genera for Russia to 64 and the total number of species to 1,268.

A review of the Mutillidae (Hymenoptera) of Azerbaijan.

Fifty-eight species in 19 genera are recorded from Azerbaijan. A new synonymy is proposed for Mutilla sinuata Olivier, 1811 (=M. binotata Radoszkowski, 1879, syn. nov.; M. araratica Radoszkowski, 1890, syn. nov.) and Smicromyrme atrithorax (Andr, 1902) (=S. kurdus Skorikov, 1935, syn. nov.). The lectotypes of seven species: Agama caucasica Radoszkowski, 1885, ; Ephutomma radoszkovskii Skorikov, 1935, ; Mutilla armeniaca Kolenati, 1846, ; M. elongata Radoszkowski, 1885, ; M. binotata Radoszkowski 1879, ; M. araratica Radoszkowski 1890, ; and M. villosa Klug 1829, are designated. Fourteen species are recorded for the first time from Azerbaijan: Dasylabris (Inbaltilla) regalis (Fabricius, 1793); D. (I.) popovi Skorikov, 1935; D. (I.) shelkovnikovi Lelej, 1985; Dentilla erronea (Andr, 1900); Myrmilla (M.) calva (Villers, 1789); M. (Pseudomutilla) glabrata (Fabricius, 1775); M. (P.) vutshetitshi Skorikov, 1927; Physetopoda daghestanica (Radoszkowski, 1885); Pseudophotopsis armeniaca (Skorikov, 1935); Smicromyrme (Astomyrme) ausonius Invrea 1950; S. (Eremotilla) novaki Invrea, 1954; S. (Smicromyrme) ruficollis ruficollis (Fabricius, 1793); S. (S.) rufipes (Fabricius, 1787); and S. (S.) tristis Lelej, 1984. Four species are excluded from the list of Azerbaijan fauna. An updated key to three Palaearctic species of Macromyrme Lelej, 1984 is given and new combination and resurrected status are proposed for Macromyrme villosa (Klug, 1829). A cluster analysis of faunal similarities among Azerbaijan, Armenia, Georgia, Turkey and three regions of Russia (Crimea, North Caucasus, south of European part) for Mutillidae produce two major clusters (index similarity 0.4): Azerbaijan, Armenia, Turkey and Georgia (bootstrap probability 45 %), and three regions of Russia (bootstrap probability 87 %). This demonstrates the important boundary between two large biogeographical subregions of Palaearctic: Mediterranean and Euro-Siberian. The Azerbaijan fauna, especially Nakhchivan Autonomous Republic, is most closely related with the Armenian fauna.

The bees of the genus Andrena Fabricius, 1775 (Hymenoptera, Andrenidae) described by Ferdinand Morawitz from the collection of Aleksey Fedtschenko.

The type specimens of the genus Andrena Fabricius, 1775, described by Ferdinand Morawitz from the collection of Aleksey Fedtschenko deposited in the Zoological Museum of the Moscow State University and in the Zoological Institute, Russian Academy of Sciences, St. Petersburg (Russia), are critically reviewed. Precise information with illustrations of types for 52 taxa is provided; of these 39 species are valid and thirteen are invalid (ten synonyms and three homonyms). Lectotypes are here designated for the following 24 nominal taxa: Andrenaacutilabris Morawitz, 1876, A.aulica Morawitz, 1876, A.bicarinata Morawitz, 1876, A.combusta Morawitz, 1876, A.comparata Morawitz, 1876, A.corallina Morawitz, 1876, A.discophora Morawitz, 1876, A.fedtschenkoi Morawitz, 1876, A.initialis Morawitz, 1876, A.laeviventris Morawitz, 1876, A.leucorhina Morawitz, 1876, A.mucorea Morawitz, 1876, A.nitidicollis Morawitz, 1876, A.oralis Morawitz, 1876, A.planirostris Morawitz, 1876, A.ravicollis Morawitz, 1876, A.rufilabris Morawitz, 1876, A.sarta Morawitz, 1876, A.smaragdina Morawitz, 1876, A.sogdiana Morawitz, 1876, A.subaenescens Morawitz, 1876, A.tuberculiventris Morawitz, 1876, A.turkestanica Morawitz, 1876, and A.virescens Morawitz, 1876.

The type specimens of bees (Hymenoptera, Apoidea) deposited in the Zoological Institute of the Russian Academy of Sciences, St. Petersburg. Contribution V. Family Andrenidae, genus Andrena Fabricius, 1775, species described by E. Eversmann.

The type specimens for names of bee taxa in the genus Andrena Fabricius, 1775 described by E. Eversmann and which are deposited in the Zoological Institute, Russian Academy of Sciences (St. Petersburg) are reviewed. Primary types of 18 taxa are illustrated and detailed information is provided. New synonymy is established for three species: Andrena fallax Eversmann, 1852 (=A. ispida Warncke, 1965, syn. nov.); A. assimilis Radoszkowski, 1876 (=A. gravida Eversmann, 1852, nec A. gravida Imhoff, 1832, syn. nov.); A. nigriceps (Kirby, 1802) (=A. nigrifrons Eversmann, 1852, syn. nov.). Based on the lectotype studying we consider Andrena fulva Eversmann, 1852 (nec A. fulva Müller, 1766) to be a junior synonym of A. (Taeniandrena) eversmanniana Osytshnjuk, 1994, stat. rev., not A. (Margandrena) marginata Fabricius, 1776, as opposed to Gusenleitner & Schwarz (2002). Corrections on lectotype data are provided for four taxa: Andrena ambigua Eversmann, 1852, A. consobrina Eversmann, 1852, A. fulvitarsis Eversmann, 1852, and A. scita Eversmann, 1852.

Additions to the cuckoo wasps (Hymenoptera, Chrysididae) of Mongolia, with description of eleven new species.

An addendum to the recent checklist of the Chrysididae from Mongolia is given. Examination of old museum material and recently collected specimens has led to the discovery of eight new records for the country and eleven new species for science. Eight species are newly recorded from Mongolia: Chrysisinclinata Linsenmaier, 1959, C.martinella du Buysson, 1900, C.speciosa Radoszkowski, 1877, Euchroeuspurpuratus (Fabricius, 1787), Holopygalucida (Lepeletier, 1806), H.similis Mocsáry, 1889, Hedychridiumfemoratum (Dahlbom, 1854) and H.leleji Rosa, 2017. Two species, Hedychridiumcupreum (Dahlbom, 1845) and H.propodeale Rosa, 2017 are excluded from the checklist of Mongolian Chrysididae: the former is described here as H.erythrosoma sp. nov., the latter is identified as H.leleji Rosa, 2017. The hitherto unknown male of Chrysismocsaryi Radoszkowski, 1889 is described and illustrated. Eleven new species are described: Chrysisstrakai sp. nov., C.woodi sp. nov., Hedychridiumerythrosoma sp. nov., H.frontale sp. nov., H.jacobsi sp. nov., H.splendens sp. nov., H.striatum sp. nov., H.varvarae sp. nov., H.weii sp. nov., Holopygatyrneri sp. nov., and Philoctetesboreki sp. nov. Keys to males and females of all known Mongolian species of Hedychridium Abeille de Perrin, 1878 are provided. The Mongolian cuckoo wasp fauna now comprises 107 species in 18 genera and two subfamilies.

The new species Gorytes mikhailovi sp. nov. from Kazakhstan with a key to the Palaearctic species of Gorytes Latreille, 1804 (Hymenoptera: Apoidea: Crabronidae).

Gorytes mikhailovi sp. nov. is described and illustrated from southeastern Kazakhstan (Zhambyl and Almaty Regions). The species groups of the Palaearctic Gorytes Latreille, 1804 (Hymenoptera: Apoidea: Crabronidae) are reviewed and an updated key to the Palaearctic species is provided.

Review of the Epeolus tarsalis species group (Hymenoptera: Apidae, Epeolus Latreille, 1802), with description of a new species.

The five species of Epeolus tarsalis species group are reviewed. One new species, Epeolus mikhailovi sp. nov. (Kyrgyzstan, Tajikistan), is described and illustrated. Epeolus melectiformis Yasumatsu, 1938 is newly recorded from China, and E. tarsalisMorawitz, 1874 is newly recorded from Kazakhstan. The distribution data for other species are supplemented. An identification key for both sexes of this species group is presented.

The type specimens of bees (Hymenoptera, Apoidea) deposited in the Zoological Institute of the Russian Academy of Sciences, St. Petersburg. Contribution IV. Family Andrenidae, genus Andrena Fabricius, 1775, species described by F. Morawitz.

The type specimens for names of bee taxa in the genus Andrena Fabricius, 1775 of family Andrenidae described by F. Morawitz and deposited in the Zoological Institute, Russian Academy of Sciences (St. Petersburg) are reviewed. Name-bearing types of 68 species are illustrated and detailed information is provided. Lectotypes are designated here for the following 32 nominal taxa: Andrena adjacens Morawitz, 1875, A. anthracina Morawitz, 1880, A. atrohirta Morawitz, 1893, A. croceiventris Morawitz, 1871, A. ehnbergi Morawitz, 1888, A. formosa Morawitz, 1877, A. glasunowi Morawitz, 1894, A. inconspicua Morawitz, 1871, A. laticeps Morawitz, 1877, A. melanura Morawitz, 1877, A. mongolica Morawitz, 1880, A. mucronata Morawitz, 1871, A. nigrobarbata Morawitz, 1871, A. nylanderi Morawitz, 1865, A. ochracea Morawitz, 1872, A. opaca Morawitz, 1868, A. orbitalis Morawitz, 1871, A. paliuri Morawitz, 1877, A. pretiosa Morawitz, 1893, A. ranunculorum Morawitz, 1877, A. rotundilabris Morawitz, 1877, A. sahlbergi Morawitz, 1888, A. salicina Morawitz, 1877, A. schencki Morawitz, 1866, A. semirubra Morawitz, 1875, A. sexguttata Morawitz, 1877, A. sylvatica Morawitz, 1877, A. transitoria Morawitz, 1871, A. truncatilabris Morawitz, 1877, A. tscheki Morawitz, 1872, A. virago Morawitz, 1894, A. curiosa Morawitz, 1877.

New records of solitary vespid wasps (Hymenoptera: Vespidae: Masarinae and Eumeninae s. l.) from the Nakhchivan Autonomous Republic of Azerbaijan.

An account on 35 species in the family Vespidae (subfamilies Masarinae, Eumeninae s. str., and Raphiglossinae) is presented. Genera Jugurtia de Saussure, 1854, Quartinia Andr, 1884, Brachypipona Gusenleitner, 1967, and Cyrtolabulus van der Vecht, 1969, as well as 17 species and one subspecies are new to Azerbaijan. Three additional species are new to the Nakhchivan Autonomous Republic; the records of nine species confirm previous doubtful reports from the territory of the autonomy. One species is excluded from the fauna of Azerbaijan. New synonymies are proposed: Antepipona orbitalis (Herrich-Schffer, 1839) = A. orbitalis ballioni (Morawitz, 1867), syn. nov.; A. varentzowi (Morawitz, 1895) = A. laevigata (Blthgen, 1951), syn. nov.; Euodynerus disconotatus (Lichtenstein, 1884) = E. disconotatus sulfuripes (Morawitz, 1885), syn. nov. = E. disconotatus laniensis Giordani Soika, 1979, syn. nov.; E. semisaecularis (von Dalla Torre, 1889) = E. semisaecularis macedonicus (Blthgen, 1951), syn. nov.; Gymnomerus laevipes (Shuckard, 1837) = G. laevipes scandinavus (de Saussure, 1856), syn. nov.; Odynerus albopictus de Saussure, 1856 = O. albopictus calcaratus (Morawitz, 1885), syn. nov. = O. albopictus kazakhstanicus Kurzenko, 1977, syn. nov. Hitherto unknown males of Brachyodynerus kusdasi Gusenleitner, 1967 and Brachypipona orientalis Gusenleitner, 2004 are described. The number of species of solitary Vespidae known from the Nakhchivan Autonomous Republic of Azerbaijan is increased to 91, with one additional subspecies which requires a revision. A preliminary list of these wasps of the whole Azerbaijan is presented; it contains 107 identified species and one additional subspecies.

New and little-known digger wasps (Hymenoptera: Ampulicidae, Sphecidae, Crabronidae) from Russia.

New additions to the knowledge of digger wasps (Ampulicidae, Sphecidae, Crabronidae) in Russia are provided. Tachysphex loktionovi Mokrousov Proshchalykin, sp. nov. is described from Tyva Republic. Five species of digger wasps are reported from Russia for the first time: Hoplammophila clypeata (Mocsáry, 1883) (Sphecidae), Tachysphex desertorum F. Morawitz, 1894, T. mongolicus Kohl, 1898, Tachytes argenteus Gussakovskij, 1933, and Trypoxylon albipes F. Smith, 1856 (Crabronidae). Misidentified Tachysphex speciosissimus Morice, 1897 (=T. gussakovskii Pulawski, 1971) is excluded from the fauna of Russia. Hitherto unknown male of Tachysphex mongolicus Kohl, 1898, stat. resurr. is described and regarded as a valid taxon. New synonymy is proposed for T. mongolicus Kohl, 1898 = T. abditus Kohl, 1898, syn. nov. Diagnosis for male of Dolichurus haemorrhous A. Costa, 1886 is updated. New regional records for seven species are recorded. The known fauna of Russia currently numbers three families, 87 genera and 694 species of digger wasps. In addition Tachytes argenteus Gussakovskij, 1933 is reported for the first time from Uzbekistan and Cyprus, and Trypoxylon beaumonti Antropov, 1991 is newly recorded from Ukraine.

The bees of the family Halictidae (Hymenoptera) described by Ferdinand Morawitz from the collection of Aleksey Fedtschenko.

The type specimens of the family Halictidae, described by Ferdinand Morawitz from the collection of Aleksey Fedtschenko deposited in the Zoological Museum of the Moscow State University and in the Zoological Institute, Russian Academy of Sciences, St. Petersburg (Russia), are critically reviewed. Precise information with illustrations of types for 43 taxa is provided. Lectotypes are here designated for the following seven nominal taxa: Halictus aprilinus Morawitz, 1876, H. cingulatus Morawitz, 1876, H. laevinodis Morawitz, 1876, H. limbellus Morawitz, 1876, H. nasica Morawitz, 1876, H. rhynchites Morawitz, 1876 and H. vulgaris Morawitz, 1876.

First checklist of the chrysidid wasps (Hymenoptera, Chrysididae) of Mongolia, with description of new species.

An annotated checklist of the Chrysididae from Mongolia is provided. A revision of the bibliographical data is provied, since most of the collecting localities published for "Mongolia" refer to places currently located in China. The known Mongolian cuckoo wasp fauna counts 90 species in 18 genera and two subfamilies. Four genera and 57 species are recorded for the first time, including two species here described as new for science: Cleptes mongolicus Rosa, Halada & Agnoli, sp. nov. (Dornod) and Spinolia spinosa Rosa & Halada, sp. nov. (Bayankhongor).

The type specimens of bees (Hymenoptera, Apoidea) deposited in the Zoological Institute of the Russian Academy of Sciences, St. Petersburg. Contribution III. Family Halictidae, genera Halictus Latreille, 1804, and Sphecodes Latreille, 1804.

The type specimens for names of bee taxa in the genera Halictus Latreille, 1804 and Sphecodes Laterille, 1804 of family Halictidae deposited in the Zoological Institute, Russian Academy of Sciences (St. Petersburg) are reviewed. Name-bearing types of 39 species and subspecies are illustrated and detailed information is provided (taxa include 15 described by F. Morawitz; nine by Yu. Pesenko; eight by P. Blüthgen; five by Yu. Astafurova M. Proshchalykin; and two by E. Eversmann). Lectotypes are designated for Halictus flavocallosus Morawitz, 1894, and H. tataricus Blüthgen, 1933.

New and little-known species of the genus Sphecodes Latreille (Hymenoptera, Halictidae) from Southeast Asia.

The available information about the cleptoparasitic bees of the genus Sphecodes in Southeast Asia is summarized. Thirty-one species are currently known from this area. Four new species are described: Sphecodes discoverlifei Astafurova & Proshchalykin, sp. nov. (Laos), S. engeli Astafurova & Proshchalykin, sp. nov. (Laos, Vietnam), S. ilyadadaria Astafurova, sp. nov. (Indonesia), and S. pseudoredivivus Astafurova & Proshchalykin, sp. nov. (Laos). Nine species are newly recorded from South East Asia: S. chaprensis Blüthgen, 1927 (Laos), S. howardi Cockerell, 1922 (Malaysia, Myanmar, Thailand), S. kershawi Perkins, 1921 (Indonesia, Malaysia, Myanmar, Thailand), S. laticeps Meyer, 1920 (Thailand, Vietnam), S. montanus Smith, 1879 (Laos), S. sauteri Meyer, 1925 (Laos), S. sikkimensis Blüthgen, 1927 (Laos, Myanmar), S. simlaensis Blüthgen, 1924 (Laos), and S. turneri Cockerell, 1916 (Laos). Based on type specimens, new synonymies have been proposed for Sphecodes kershawi Perkins, 1921 = S. javanensis Blüthgen, 1927, syn. nov.; S. simlaensis Blüthgen, 1924 = S. simlaellus Blüthgen, 1927, syn. nov.; S. laticeps Meyer, 1920 = S. biroi mariae Cockerell, 1930, syn. nov. Lectotypes are designated for Sphecodes biroi Friese, 1909, S. simlaellus Blüthgen, 1927, and S. laticeps Meyer, 1920. The female of Sphecodes sauteri Meyer, 1925, and the male of S. turneri Cockerell, 1916 are described for the first time.

Additional records of osmiine bees (Hymenoptera: Megachilidae: Osmiini) from Siberia.

In addition to a previously published study about Siberian osmiine bees, we here further report records of 19 rarely collected and little known species. Twenty-seven species of osmiine bees are currently known from Siberia. Hoplitis beijingensis Wu, 1987, H. kaszabi Tkalcu, 2000, and H. inconspicua Tkalcu, 1995 are recorded for the first time for Russia and Hoplitis maritima (Romankova, 1985), Osmia inermis (Zetterstedt, 1838), and O. disjuncta Tkalcu, 1995 are new to Siberia. Two species, Hoplitis fulva (Eversmann, 1852) and H. papaveris (Latreille, 1799), are excluded from the list of Siberian bees. The male of Hoplitis daurica (Radoszkowski, 1887) is described for the first time, the taxonomic status of Osmia ephippiata Smith, 1879 is discussed and a lectotype is designated for Hoplitis scita (Eversmann, 1852).