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Extracted from: Cockerell T.D.A. (1919). The Bees of the Rocky Mountain National Park (Hymenop.). Entomological News Vol. 30.
Female. Length about 6.5 mm., anterior wing 5.4 mm.; black, including legs, but the flagellum with a light fulvous streak beneath, not reaching base or apex; hair of head and thorax scanty, sordid white; head longer than broad; mandibles reddened at apex; lower part of clypeus shining, upper part dull; supraclypeal area shining; front dull, the whole surface minutely sculptured between the punctures; mesothorax dull, with very fine punctures, and the surface lineolately sculptured between; area of metathorax very finely and delicately wrinkled; tegulae piceous; wings dusky hyaline. stigma reddish brown; hind spur pectinate with few spines: abdomen shining, not banded, hind margins of segments brownish.
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