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. lewisorum and is distinguished from that species by the more widely separated punctures of the mesoscutum and metasomal tergum 2 and by the smaller size.
FEMALE. — Integument olive-green; antenna uniformly dark brownish-black, clypeus almost entirely dark, with violaceous reflections except narrow basal border, forewing with stigma yellow, brown; pubescence pale, white except brownish on antennal scape and inner orbits, rust-brown on anal fimbria; facial fovea with sheen gray-black, tomentum white. Head shiny, densely punctate; clypeus, latero- and supraclypeal areas closely, coarsely punctate with shiny, smooth interspaces, punctures separated by less than one diameter, nearly contiguous on latero- and supraclypeal areas; facial fovea extending from summit of eye to lower edge of antennal base; eyes essentially parallel along inner margins; antennae with segments 1 to 3 of flagellum as 9:4:4; labrum with process bifid (fig. 11); subgenal coronet short with 3 to 4 spines visible posteriorly; gena moderately densely, coarsely punctate with shiny, smooth interspaces, punctures separated by about one diameter or less; pubescence of clypeus short, sparse, suberect. Mesosoma shiny, coarsely, closely punctate with shiny, smooth interspaces; pronotum tessellate-punctate, dorsolateral angle obtuse, not elevated, with lateral fold; mesoscutum with notaulus moderately distinct; mesoscutum, scutellum and metanotum with punctures separated by less than one diameter, interspaces smooth, shiny; propodeum moderately shiny, rugose-punctate, enclosure irregularly rugose with faint median basal longitudinal carina; episternum 2 dull, coarsely, closely tessellate-punctate; wing pale, submarginals 1: 2 (28: 28), stigma : rest of marginal cell (25: 36), hind wing with jugal lobe broad and with incision between it and vannal, reaching beyond level of cu-v; posterior trochanter with long, curved, white, perfect floccus; tibial scopa moderately long, loose, simple except for narrow band of plumose hairs along posterior surface, posterior hairs of scopa about one and one-half times as long as width of tibia at apex; pubescence of mesoscutum of two lengths, with many short and few long hairs interspersed. Metasoma shiny, coarsely, densely punctate, with smooth, shiny interspaces; tergum 1 with punctures usually separated by 1 to 2 diameters, occasionally up to 4 diameters; punctures of terga 2 to 5 separated by one diameter or less; terga 1 to 5 with complete hair bands on apical depressed margins. Length 6.5 to 7 mm, forewing 5 mm.
MALE. — Integument olive-green; antenna uniformly dark brownish-black, clypeus except for narrow basal border, dark with violaceous reflections, forewing with stigma yellow-brown; pubescences pale, white except for yellow-brown anal fimbria. Head shiny, densely punctate; clypeus, latero- and supraclypeal areas coarsely, closely punctate with shiny interspaces, clypeus with punctures separated by less than one diameter, latero- and supraclypeal areas with punctures nearly contiguous; parocular depression short, linear; eyes essentially parallel along inner margins; antenna with segments 1 to 3 of flagellum as 7:4:7; labrum with process bifid (fig. 12); mandibles moderately long, decussate; gena dorsally moderately closely, coarsely punctate with shiny, smooth interspaces, punctures separated by about one diameter, gena ventrally with punctures more sparse and finely tessellate, shiny interspaces; pubescence of clypeus moderately long, dense, subdepressed. Mesosoma coarsely, closely punctate with shiny, smooth interspaces; pronotum punctate-punctate, dorsolateral angle obtuse, not elevated, with small lateral fold; mesoscutum with punctures separated by about one diameter, notaulus moderately distinct; scutellum and metanotum with punctures separated by less than one diameter, metanotum with tessellate interspaces; propodeum moderately shiny, rugose-punctate, enclosure irregularly rugose with longitudinal median carina; episternum 2 dull, coarsely, closely punctate with tessellate interspaces; wing pale, submarginals 1: 2 (22.5:24.5), stigma : rest of marginal cell (23:31), hind wing with jugal lobe broad and with incision between it and vannal, reaching beyond level of cu-v, pubescence of mesoscutum long, pale. Metasoma shiny, coarsely, densely punctate, with smooth, shiny interspaces; tergum 1 with punctures usually separated by 1 to 2 diameters, occasionally up to 4 diameters; punctures of terga 2 to 5 separated by one diameter or less; sternum 8 (fig. 72); terga 1 to 5 with complete hair bands on apical depressed margins. Length 5.5 to 6 mm, forewing 4 to 4.5 mm.
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