Andrena (Brachyandrena) limonii Osytshnjuk, 1983

Ariana, Ardeshir, Scheuchl, Erwin, Tadauchi, Osamu & Gusenleitner, Fritz, 2009, A taxonomic revision of the subgenus Andrena (Brachyandrena) (Hymenoptera: Andrenidae), Zootaxa 2281, pp. 21-39 : 36-38

Andrena (Brachyandrena) limonii Osytshnjuk, 1983

( Figs. 2 C, 10C, 11)

Andrena limonii Osytshnjuk, 1983: 21 –24 (female, male). Type location: Southern Russia ("Volgograd"), Kazakhstan ("Karaganda reg."). Type depository: Zoological Museum of the Moscow Lomonosov State University, Russia.

Female (holotype): BL = 8 mm, WL = 5.7 mm.

Color. Flagellum brown; mandible nearly reddened; clypeus with feebly yellow spot around midline; wing membrane subhyaline; veins and pterostigma brown; posterior part of tegula translucent, pale brown, anterior part dark brown; the rest of body dark brown to black.

Pubescence. Hairs on head and thorax short, moderately dense; those on clypeus 200–300 µm, transparent white; those on antennal area dense, white; those on vertex pale yellow, short (300 µm); those on genal area white; facial fovea white, with sparse hairs. Hairs on mesoscutum and scutellum short (200–300 µm), with scale-like hairs, whitish; those on mesepisternum simple, long and white; propodeal corbicula not well developed, with dull white long plumose dorsal fringes, internal area with simple hairs, without anterior fringes; trochanteral flocculus perfect, white; femoral flocculus perfect; tibial scopa relatively short, with simple hairs; whitish. Hairs on metasomal terga scanty, T1 with incomplete hair bands, T2–4 with complete whitish hair bands. Caudal fimbriae brown, S2–5 with white short subapical fimbriae.

Structure. Head: HL/HW = 0.78, HW:MsW:MtW = 1.4:1.3:15. Vertex narrow, less than ocellar diameter, sparsely punctate; surface smooth and shiny, OOD:POD:OCD = 3:2:1; FL1<FL2+FL3, FL2 = FL3; inner margin of eyes subparallel; Facial fovea in upper part occupying 1/2 or more of distance between compound eye and lateral ocellus, exceeding the lower level of antennal socket, FVL = 1.2 mm, FVW = 0.3 mm in upper part, FVW = 0.15 mm in lower part, facial quadrangle longer than wide. Face above antennal fossae with small punctures, with longitudinal rugulae, interrugal space smooth and shiny. Clypeus strongly convex, with sparse small shallow punctures (Pd = 10 µm, IS<0.1), without impunctate median line, shiny and smooth; CPL = 0.9 mm. Process of labrum weakly emarginated; lower paraocular area with sparse irregular shallow PP (Pd = 5–20 µm, IS = 0.1). Malar space linear. Genal area smaller than eye (5:3), surface with very dense and small PP (Pd = 10 µm, IS<0.1) near eye.

Mesosoma: Pronotum without humeral angle, with dorsolateral suture, smooth and shiny with scattered PP, median part of dorsal area with dense and smaller PP, lateral side tessellate. Mesoscutum with dense punctures, surface smooth and shiny, scutellum similar to mesoscutum. Propodeal enclosure medium size, well indicated by boundary line, strongly rugose with strong carina, interrugal surface smooth and shiny. Mesepisternum with sparse PP, posterior part with small PP, surface tessellate to nearly shagreened with bigger PP; anterior part of tegula with PP.

Metasoma: Metasomal terga with dense, small PP, completely smooth and shiny; posterior depression of T2–5 distinct; pygidial plate large, U-shaped, tessellate, with internal raised area; S2–5 tessellate with very small and shallow PP, anterior margin without PP.

Male [Stalingr. Obl., Tinguta (=Volgograd, Russia), 3. viii. 1954; I. Razumova]: BL = 7 mm.

Color. Flagellum reddish brown; clypeus whitish yellow; mandible nearly black darkened above; wing membrane subhyaline, veins and pterostigma dark brown; the rest of body black.

Pubescence. Hairs on head and thorax short, but not scale-like, whitish to yellowish-white; hairs on mesoscutum, scutellum and metanotum simple, whitish. T1–4 with dense, whitish hairbands, interrupted on T1– 3. S2–5 with sparse, whitish subapical fimbriae.

Structure. Head: Vertex narrow, as wide as ocellar diameter, punctures sparse to moderately dense. FL1<FL2+FL3, FL2 = FL3; inner margins of eyes parallel; facial quadrangle quadrate. Clypeus with dense punctures, with indistinct impunctate median line, surface shagreened superficially, smooth and shiny medioapically. Process of labrum trapezoidal, apical margin thickened and emarginated. Malar space linear.

Mesosoma: Pronotum without humeral angle. Mesoscutum with moderately dense PP, (IS = 1), scutellum with dense PP (IS<1), surface of both smooth and shiny. Propodeal enclosure small, strongly rugose with median carina, interrugal surface smooth and shiny. Mesepisternum with moderately dense PP posteriorly, and very dense PP anteriorly, surface shagreened very superficially, shiny.

Metasoma: Metasomal terga smooth and shiny, T1 with moderately dense PP, dense on posterior margin; T2–5 including posterior depressions with dense PP (IS = 1–2); S2–5 smooth and shiny, with scattered PP.

Variation. Extent of yellow spot on the clypeus is variable among females. Surface of process of labrum varies from weak transversal wrinkles to smooth. Enclosure area differs in height and shape of longitudinal and transversal carinae.

Remarks. This species is clearly different from the other known species of this subgenus. Some important differences are as follows: the facial fovea occupying more than 1/2 distance between the eye and lateral ocellus, the mesepisternum finely shagreened, sparsely punctate and without fovea, surface of the propodeal corbicula smooth and shiny without any wrinkles.

Specimens examined: 1 female, Karagandinsk (=Karaganda, Kazakhstan), Russia, 8.viii.1959 (Zhana- Arka Konseng), det. Rudolph; 1 female, Koksengir [Karaganda Prov., Kazakhstan], 20.vii.1951 (Zhana-Arka Konseng), det. Ponomareva; 1 male, Stalingr. Obl., Tinguta (=Volgograd, Russia), 3. viii. 1954 (I. Razumova).