Hylaeus (Hylaeus) oehlkei Dathe, 2010

Proshchalykin, Maxim Yu. & Dathe, Holger H., 2016, Additional records of the genus Hylaeus Fabricius, 1793 (Hymenoptera: Apoidea: Colletidae) from Siberia, with description of a new species, Zootaxa 4105 (4), pp. 301-320 : 309-310

Hylaeus (Hylaeus) oehlkei Dathe, 2010

Figs 6–8

Hylaeus oehlkei Dathe, 2010: 55 , ♂ (type locality: Mongolia, Töv, Bogd uul S Ulaan Baatar). Holotype in SDEI.

Material examined. Altaiskiy Territory: 1 ♀, 30 km S Kur’ya, Savvushka, 31.VII–1.VIII.2007, SAB ( ZISP); Tyva Republic: 1 ♂, 31 km NEE Erzin, Erzin River, 18.VII.2014, ASL, MYP, VML ( IBSS); 1 ♂, 23 km E Samagaltai, Shuurmak River, 19.VII.2014, ASL, MYP, VML ( IBSS); Krasnoyarsk Territory: 1 ♀, 10 km NE Minusinsk, Malaya Minusa River, 4.VII.2012, MYP, VML ( IBSS); 1 ♀, 1 ♂, 10 km NW Minusinsk, Bystraya River, 9.VII.2014, MYP, VML ( IBSS).

Remarks. Hylaeus oehlkei was described from males only ( Dathe 2010). Recently, material became available containing both sexes, thus permitting the description of the hitherto unknown female.

Diagnosis. This female is readily recognised by the three-coloured mask of the long-oval, tapered face with its strongly domed postocellar area; basal area of propodeum with irregular wrinkles.

Description. Female. Measurements (n=3): total length 5.7–6.1 (5.90) mm, wing length 4.2–4.6 (4.37) mm. Head proportions HL:HW 1.05, UHW:LHW 1.58 ( Fig. 6 ); outline longitudinally elliptic, converging below, vertex bulged. Scapi black, flagella black, underneath not or hardly brighter. Face with yellow side spots, filling paraocular area more or less up to dorsal clypeus margin; anterior margin of clypeus with red margin ( Fig. 6 ). Foveae faciales of medium length, reaching upper eye border. Clypeus CL:CW 1.35, longitudinally striate, matt, anteriorly with scattered shallow punctation; supraclypeal area separated from clypeus by fine seam, lower part with a similar structure, upper part angularly offset, with a gradual transition to the frons. Frons medially with subcontiguous moderate punctation, interspace smooth and shiny; vertex somewhat coarser and more sparsely punctate. Genae normal, striate and shallowly punctate; occiput rounded; malae narrow. Labrum and the bifid mandibles black. Mesosoma long-oval, rounded; pilosity inconspicuous, with short white hairs only. Coloration black, pronotum without flecks, tegulae and calli with a small yellow spot each. Pronotum rounded throughout, anterior margin in the middle dull, dorsolateral angles blunt. Mesonotum ( Fig. 7 ) finely shagreen, silkily shiny, punctation moderate, dense to close; scutellum shiny; metanotum matt, with shallow punctation; mesopleurae ( Fig. 8 ) with punctation similar to mesonotum, anterior margin rounded, edged just before episternal groove only. Legs black, only small parts of tibia bases yellow; wings lightly browned, venation brown, costae black. Propodeum ( Fig. 7 ) rounded, surface grid wrinkled, slightly shiny; basal area marked by a furrow, at its ground with irregular wrinkles, distal margin medially delimited by a fine, indistinct transverse edge; terminal area rugose, silkily shiny. Metasoma spindle-shaped, coloration black. T1 ( Fig. 7 ) smooth and shiny, with sparse to scattered, fine punctation; following terga, with denser punctation; terga without lateral fringes; fringe of last sternum yellowish.

Distribution in Siberia. *Altaiskiy Territory, *Tyva Republic, *Krasnoyarsk Territory.

General distribution. Mongolia, * Russia.

Figures

FIGURES 6 – 8. Hylaeus (Hylaeus) oehlkei Dathe, female from Krasnoyarsk Territory: 6 — face; 7 — propodeum and basal terga; 8 — mesopleura. Scale bar 1 mm.