New and little-known bees of the genus Hylaeus Fabricius, 1793 (Hymenoptera, Colletidae) from the Caucasus region Author Proshchalykin, Maxim Yu. https://orcid.org/0000-0001-7870-8226 Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far East Branch of the Russian Academy of Sciences, Vladivostok 690022, Russia proshchalikin@biosoil.ru Author Dathe, Holger H. Senckenberg Deutsches Entomologisches Institut, Eberswalder Str. 90, 15374 Muencheberg, Germany text Journal of Hymenoptera Research 2021 2021-08-24 84 169 185 http://dx.doi.org/10.3897/jhr.84.68250 journal article http://dx.doi.org/10.3897/jhr.84.68250 1314-2607-84-169 CFEA62B1127D450EA9CB6656D163E84F B5FCA3CDF55E537480061A3DEC421344 5349509 2. Hylaeus (Dentigera) alievi Dathe & Proshchalykin sp. nov. Figures 1-8 Material examined. Holotype : ♂ , Azerbaijan : Nakhchevan Autonomous Republic , Shakhbuz , Zarnatun , 39°31'N , 45°46'E , 1550 m , 18.VI.2019 , M. Proshchalykin , Kh. Aliyev, M . Maharramov [FSCV] . Paratypes : ibid. 14.VI.2019 ( 4 ♂ ), 18.VI.2019 ( 3 ♂ ), 24.-25.VII.2018 ( 1 ♂ ); Sharur , Akhura 39°33'N , 45°13'E , 1640 m , 13.VI.2019 ( 4 ♂ ); Shakhbuz , Gizil Gishlag, 39°28'N , 45°35'E , 1460 m , 19.VI.2019 ( 1 ♂ ); leg. M. Proshchalykin , Kh. Aliyev, M . Maharramov [FSCV/ SDEI] . Diagnosis. This is a small species of the Hylaeus brevicornis group with a short head. In the species of this group ( Dathe 1980b : 232; Michener 2007 : 204) the metasomal terga are distinctly shagreen and densely punctate; particularly characteristic is the genital capsule of males with curved penis valves with basal tooth in dorsal view (Fig. 8 ). This male is hardly separable using conventional characters from similar species with a strongly thickened scape and blunt bicuspid transverse callus on S3. However, the peculiar shape of apical lobes of S7, with long bristles, is unique in the group. The female is unknown. Description. Male. Number of specimens: 14. Total length 4.3-4.9 (mean 4.60) mm, wing length 2.7-3.3 (3.10) mm. - Head (Figs 1 , 2 ) proportions: head length to width ratio 0.87-0.94 (mean 0.91), upper face width to lower face width ratio 1.42-1.59 (1.49); outline rounded-trapezoid. Pilosity short and sparse. Scapes black, laterally with expanded bright yellow area; strongly dilated, scape length to width ratio 1.22-1.59 (1.49). Flagella relatively short, blackened above, yellow below. Mask complete, white, side patch expanded beyond upper margin of scape base, pointed toward orbits. Foveae faciales short, close to the upper margin of the eye. Clypeus length to width ratio 1.11-1.21 (1.16); surface flat, silky-shiny, shagreen with shallow, sparse punctation, anterior margin black. Supraclypeal area white, black on the tip only, transition to the frons fluid. Frons and vertex shagreen with subcontiguous fine punctation; posterior of vertex punctured more coarsely and sparsely. Genae streaked with elongated punctation; occiput rounded; malae very narrow. Labrum black, the bifid mandibles black with brown tips. - Mesosoma (Figs 2-4 ). Oval, rounded; pilosity reduced, thorax and propodeum sparsely short-haired, also on underside. Coloration black, pronotum with yellow strip that can be narrowly interrupted in the middle, pronotal lobes (calli) totally, tegulae on anterior half yellow. Pronotum somewhat expanded, anterior margin narrow in the middle, dorsolateral angles blunt. Mesonotum (Fig. 2 ) shagreen, hardly shiny, punctation moderate, dense; scutellum posteriorly with coarser and more scattered punctation; mesopleura (Fig. 4 ) with punctation somewhat more disperse, anterior margin rounded. Legs black, with yellow anterior surface of foretibiae, base and tips of other tibiae as well as basitarsi, and white second tarsomere; remaining tarsomeres blackened; wings clear, venation brown. Propodeum (Fig. 3 ) rounded; basal area sharply net-wrinkled, shiny, laterally demarcated by a row of meshes; lateral areas finely wrinkled, matt; terminal area with finely sculptured surface, glossy, propodeal furrow narrow. - Metasoma (Figs 2 , 5 ) cylindrical, coloration black. T1 strongly shagreen, matt with dull lustre, punctation fine, close; T2 and following terga more finely and densely punctate; lateral parts of terga with narrow fringes of cilia. S3 with an obliquely raised bicuspid transverse callus (Fig. 5 ). Terminalia (Figs 6-8 ): S7 with triangular apical lobes, laterally with six distinct long bristles on each lobus; S8 rhombiform, weakly sclerotized, apically with only a short, obtusely angled tip; genital capsule of the normal template; penis valves of Hylaeus brevicornis scheme, but only slightly curved and quite close together, in dorsal view shorter than the gonoforcipes. Figures 1-8. Hylaeus (Dentigera) alievi Dathe & Proshchalykin, sp. nov., holotype, male 1 head, frontal view 2 habitus, dorsal view 3 propodeum 4 mesopleuron 5 metasterna with bicuspid transverse callus on S3 6 sternum 7 7 sternum 8 8 copulatory capsule. Scale bars: 0.5 mm. Female. Unknown. Etymology. We dedicate the new species to our friend and colleague Dr. Khalid Ali Aliyev (1949-2019) in his honorable memory. He added significantly to the knowledge of the bee fauna of Transcaucasia and was actively involved in the expeditions which yielded the material assessed here. Distribution. Azerbaijan (Nakhichevan AR).