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Andrena subapasta Thorp, 1969
Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Diandrena


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Reprinted by permission of the Regents of the University of California from: Thorp, R. W. 1969. Systematics and ecology of bees of the subgenus Diandrena (Hymenoptera: Andrenidae). University of California Publications in Entomology 52: 1-146.

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This species is most closely related to A. apasta and is distinguished from that species by its smaller size, lighter and more greenish integument, the narrow jugal lobe without an incision between it and the vannal lobe, the narrower and more deeply emarginate apex of the labral process, and the outer margins of the facial foveae which are adjacent to and parallel the inner margins of the eyes over their entire length.

FEMALE. Integument dark olive-drab; antenna uniformly dark brownish-black, forewing with stigma dark brownish-black, clypeus with moderately broad subapical dark band with violaceous reflections; pubescence pale, white except face black except for latero-apically on clypeus, occiput, and lower gena immediately behind mandibular base white, pleura black except episternum 2 ventrally, propodeal corbicula black, legs black except anterior outer face of hind tibial scopa white, anal fimbria pale brown; facial fovea with black sheen, tomentum brown. Head moderately dull, moderately coarsely punctate with tessellate interspaces; clypeus, latero- and supraclypeal areas with punctures separated by one diameter; facial fovea extending from summit of eye to below antennal base, parallel and adjacent to inner margin of eye for entire length; eye slightly arcuate medially; antenna with segments 1 to 3 of flagellum as 10:4:4; labrum with process weakly emarginate apically (fig. 53); subgenal coronet short, moderately well developed; gena moderately dull, moderately finely, sparsely punctate with tessellate, finely striate interspaces, punctures separated by 2 diameters; pubescence of clypeus moderately long, sparse, suberect. Mesosoma moderately dull, coarsely, shallowly punctate with granular interspaces; pronotum with punctures separated by 1 to 2 diameters, less than one diameter medially, dorsolateral angle absent, without lateral fold; mesoscutum with punctures separated by 1.5 to 2 diameters, notaulus indistinct; scutellum with punctures separated by one diameter or slightly more; metanotum with punctures separated by less than one diameter; propodeum moderately coarsely punctate with tessellate interspaces, punctures separated by one diameter, enclosure with fine, sparse, very short, longitudinal rugulae basally, otherwise granular; episternum 2 coarsely, deeply punctate with tessellate interspaces, punctures separated by 1.5 to 2 diameters; wing infuscated, submarginals 1:2 (30:27.5), stigma : rest of marginal cell (27:36), hind wing with jugal lobe moderately narrow and without incision between it and vannal, reaching level of cu-v; posterior trochanter with long, curved, gray, perfect floccus; tibial scopa with moderately long, moderately sparse simple hairs, only posterior fringe with branched hairs, posterior scopal hairs one and one-half times as long as width of tibia at apex; pubescence of mesoscutum with few long and many moderately short hairs intermixed. Metasoma moderately dull, moderately coarsely, sparsely punctate with granular interspaces; first tergum with punctures separated by 2 to 3 diameters, terga 2 to 4 with punctures separated by 2 diameters ; pubescence long, erect on basal elevation of first tergum, short, suberect on tergum 2, short, subdepressed on terga 3 and 4. Length 7 to 8 mm, forewing 5.5 to 6 mm.

MALE. Integument dark olive-drab with bluish reflections on apical depressed margins of metasomal terga 2 to 4; antenna uniformly dark brownish-black, forewing with stigma yellow-brown, clypeus with moderately broad transverse dark band with violaceous reflections; pubescence pale, white except anal fimbria golden, face above and lateral to clypeus, above eye, upper gena, and narrowly behind eye on lower gena black, prothorax, pleurae, and propodeum black except white centrally on episternum 2. Head moderately dull, closely, coarsely punctate with tessellate interspaces; clypeus, latero- and supraclypeal areas with punctures separated by less than one diameter; parocular depression very long, linear; eyes convergent below; antenna with segments 1 to 3 of flagellum as 12:6:8.5; labrum with process broad, weakly emarginate apically (fig. 54); mandibles short; gena moderately shiny, moderately finely, sparsely punctate with tessellate interspaces and fine, longitudinal, short striae associated with and more or less obscuring punctures, punctures separated by about 2 diameters; pubescence of clypeus long, dense, subdepressed. Mesosoma dull, coarsely, shallowly punctate with granular interspaces; pronotum with punctures separated by 2 diameters, interspaces transversely tessellate, dorsolateral angle absent, without lateral fold; mesoscutum with notaulus indistinct; mesoscutum and scutellum with punctures separated by 1 to 2 diameters; metanotum with punctures separated by one diameter or less; propodeum dull, coarsely punctate with granular interspaces, punctures separated by one diameter, enclosure granular; episternum 2 moderately coarsely, closely punctate with tessellate interspaces, punctures separated by one diameter; wing pale, submarginals l:2 (34:26), stigma : rest of marginal cell (31:37), hind wing with jugal lobe narrow, without incision between it and vannal, reaching level of cu-v; pubescence long, sparse. Metasoma dull moderately coarsely, sparsely punctate with granular interspaces; first tergum with punctures separated by 2 to 4 diameters, terga 2 to 5 with punctures finer, more obscure, separated by 2 diameters; pubescence on basal elevation of first tergum long, erect, on basal elevations of terga 2 to 5 short, suberect, spatulate hairs apicolaterally on terga 1 to 3 forming weak, medially interrupted hair bands, hair bands more or less complete on terga 4 and 5. Length 6 to 7 mm, forewing 5 to 6 mm.

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