Reprinted with permission from: Viereck, H. L. 1924. Prodromus of Andrena, a genus of bees. Canadian Entomologist 56: 19-24, 28-32, 76-81, 237-244.
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Related to A.(A.) washingtoni mantiouensis Viereck and Cockerell. (= A. (Thysandrena) vierecki)
MALE. � Length 10mm; body black, mostly covered with more or less ochreous hair; temples produced trapezoidal; almost reflexed but not angular, head covered with ochreous hairs except along the inner, outer and upper eye margin, and on most of the front where the hairs are black, clypeus nearly convex, partly planate, shining and distinctly punctured much like the face, clypearea wanting, sculpture of the clypeus not hidden by the moustache, labrarea with a broad rounded emargination, polished, joint 3 of antennae is to 45 as 10 is to 7, flagel undulate in outline, antennae blackish throughout, mandibles nearly typical, rather slender, extending beyond the outer edge of the labrum and nearly to end of basal third of its fellow, lower edge at base with a rudimentary tooth, palpi nearly typical; thorax covered with an abundance of more or less pale ochreous hairs, dorsulum dullish, mesopleura with paler ochreous hairs throughout than the dorsulum, membrane uniformly tinged with brown, legs blackish brown excepting the small joints of the tarsi which are rather dark brownish, legs covered with pale ochreous or brownish hairs; propodeum with its enclosure poorly defined, with irregular rugae on basal half, finely reticulated on apical half, rounded off at apex, rest of upper face with pale ochreous hairs; propodeal pleura not nearly hidden by the uniformly distributed pale ochreous hairs; abdomen with its tergum shining, almost polished, finely reticulated and indistinctly punctured, first tergite, with erect hairs, seventh sternite of the helvola type, eight sternite ending as in manitouensis, no appreciable hair bands on the tergum, hair at apex of abdomen of a golden hue; hypopygium of the durangoenisi type but with the wide part of the process not attenuated as in species.
HOLOTYPE. � Male. Lillooet, B.C., May 9, 1916, (E.M.Anderson); no. 771 in the Canadian National Collection, Ottawa.
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