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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. Like H. viridatus Lovell, with the same highly characteristic radiating plicae on area of metathorax, though these are not quite so strong. It differs from H. viridatus by the dusky stigma and entirely black abdomen. The antennae are only slightly reddish beneath toward apex. Supraclypeal area and upper part of clypeus brassy; front blue-green, dullish, very densely punctured, its lower part micro-scopically transversely lineolate: mesothorax and scutellum dullish rather dark blue-green; pleura dark blue-green ; tegulae piceous; wings dusky; stigma and nervures dilute brownish; hind spur with large spines; abdomen polished; second segment with thin white hair at sides and base; third and following segments thinly hairy all over.
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