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. sperryi and may be distinguished from that species by the larger size and the closer, nearly contiguous spacing of the punctures on the mesoscutum and on metasomal tergum 2.
FEMALE. — Integument olive-green; antenna usually uniformly dark brownish-black, clypeus with large subapical dark triangle with violaceous reflections, forewing with stigma dark reddish-brown; pubescence pale, white; facial fovea with sheen gray-white, tomentum white. Head densely punctate with smooth, shiny interspaces (occasionally finely tessellate); clypeus, latero- and supraclypeal areas coarsely, closely punctate, punctures separated by less than one diameter; facial fovea extending from summit of eye to middle of antennal base; eye slightly arcuate medially; antennae with segments 1 to 3 of flagellum as 13:6:6; labrum with process bifid (fig. 13); subgenal coronet short with few, poorly defined teeth posteriorly; gena dorsally densely punctate with tessellate interspaces, punctures separated by about one diameter, ventrally finely, longitudinally striate-punctate with tessellate interspaces; pubescence of clypeus short, sparse, subdepressed. Mesosoma coarsely, closely punctate with shiny, smooth interspaces; pronotum coarsely, irregularly punctate with tessellate interspaces; moderately shiny, dorsolateral angle rounded with very small lateral fold; mesoscutum with notaulus indistinct; punctures of mesoscutum and anterior three-fourths of scutellum separated by less than one diameter, occasionally confluent, interspaces smooth and shiny; posterior fourth of scutellum and metanotum dark, contiguously rugose-punctate; propodeum rugose-punctate, shiny, enclosure irregularly rugulose; episternum 2 rugose-punctate; wing infuscated, submarginals 1:2 (35:40), stigma : rest of marginal cell (15:25), hind wing with jugal lobe broad and with incision between it and vannal, not reaching 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 two times as long as width of tibia at apex; pubescence of mesoscutum of two lengths, numerous short and few long hairs interspersed. Metasoma coarsely, densely punctate with shiny, finely tessellate interspaces; terga 1 to 4 with punctures separated by one diameter or less; terga 2 to 4 with complete hair bands on apical depressed margins, becoming more distinct on succeeding segments. Length 9 to 10 mm, forewing 6.5 to 7 mm.
MALE. — Integument olive-green; antenna usually uniformly dark brownish-black, clypeus with narrow subapical dark band with violaceous reflections, forewing with stigma dark reddish-brown; pubescence pale, white. Head densely punctate with shiny interspaces; clypeus, latero-and supraclypeal areas coarsely, closely punctate, punctures separated by less than one diameter; parocular depression, short, linear; eyes slightly convergent below; antenna with segments 1 to 3 of flagellum as 13: 9: 10; labrum with process broad, slightly emarginate with median outer groove (fig. 14); mandibles moderately long; decussate; gena dorsally densely punctate with tessellate interspaces, punctures separated by about one diameter, ventrally finely, longitudinally striate-punctate with tessellate interspaces; pubescence of clypeus long, dense, subdepressed. Mesosoma coarsely, closely punctate with smooth, shiny interspaces; pronotum coarsely, irregularly punctate with tessellate interspaces, moderately shiny, dorsolateral angle rounded with very small lateral fold; mesoscutum with punctures separated by less than one diameter, notaulus indistinct; scutellum with punctures contiguous; metanotum contiguously rugose-punctate; propodeum rugose-punctate, shiny, enclosure rugulose with median longitudinal carina; episternum 2 rugose-punctate; wing lightly infuscated, submarginals 1:2 (34:39), stigma : rest of marginal cell (15:25), hind wing with jugal lobe broad and with incision between it and vannal, reaching level of cu-v; pubescence of mesoscutum uniformly moderately long and moderately dense. Metasoma coarsely, densely punctate with shiny, finely tessellate to smooth interspaces; terga 1 to 5 with punctures separated by one diameter; sternum 8 (fig. 73); genital capsule (fig. 61); hair bands not distinct as in female except on apical depressed margins of terga 4 and 5. Length 8 to 9 mm, forewing 5.5 to 6.5 mm.
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