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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 mm., anterior Wing about 5.3 mm.: black, including legs and antennae, apical half of mandibles reddened; hair of head and thorax scanty, sordid white; head rather elongated, with prominent clypeus, which is shining, with large sparse punctures; supraclypeal area and sides and lower part of front shining, the front extremely densely and finely punctured; Illesothorax and scutellum polished, with fine rather sparse punctures; area of metathorax very finely wrinkled, its posterior margin prominent, obtuse, shining; posterior truncation shining, concave in lateral view: tegulae black with a brown spot: wings hyaline, stigma and nervures reddish brown: second submarginal cell broad ; legs with white hair, a red brush at end of hind basitarsus: hind spur with three large spines; abdomen shining, prttinose with dull white pubescence, but without distinct bands or hair-patches.
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