Reprinted with permission from: Mitchell, T.B. 1962 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 152.
FEMALE — Length 12 mm.; dark becoming almost black on vertex and dorsum thorax; face only slightly longer distance between eyes above; eyes subparallel; lateral ocelli much nearer to each other eyes, much nearer eyes than margin vertex; clypeus broad and very short, median area strongly convex, apical margin slightly produced, with an elevated, median, apical protuberance which is somewhat excavated apically, depressed areas on side very slightly emarginate (fig. 30); labrum with rather copious, black pubescence, median length slightly greater than width; mandibles very similar to those cha2ybea (fig. 32); width of cheeks nearly twice that of eyes; wings rather lightly becoming somewhat more deeply marginal cell, 2nd recurrent vein reaching 2nd submarginal cell slightly nearer than 1st does to base; tarsal segments simple and unmodified, mid and hind, spurs piceous; pubescence rather short and inconspicuous, white in large part on head and thorax, more dense around antennae, on cheeks below, and around wing bases, pale on legs large part, becoming blackish on hind tarsal segments; scopa entirely black, discal of abdominal terga very short inconspicuous, barely visible, entirely pale, rather dense and subappressed tergum 6; punctures quite deep and distinct, rather coarse and slightly separated on vertex and on scutum toward posterior margin medially, those on scutellum distinctly but widely separated; pleura rather dull, rather coarse and close punctures throughout; lateral faces of propodeum, dull, with fine densely crowded punctures, posterior face shining, punctures fine and to some degree separated, dorsal area smooth and somewhat shining, upper margin becoming very narrowly striate; punctures of abdominal terga deep, distinct and well separated on terga 1-4, these becoming rather close toward sides, rather uniformly close across 5, very fine and densely crowded on 6.
MALE—Length 9 mm.; dark blue, becoming almost black on dorsum of thorax; face considerably longer than distance between eyes above; eyes very slightly convergent below; lateral ocelli nearer each other than to eyes and nearer eyes than to margin of vertex; clypeus broadly convex, apical margin somewhat produced, rather broadly outcurved, median area rather straight; labrum with rather copious pubescence, median length about equal to basal width; mandibles bidentate; cheeks slightly broader than eyes; wings very lightly infuscated, recurrent veins reaching 2nd submarginal cell subequally distant from base and apex; tarsal segments simple and unmodified, anterior margin of hind basitarsus with a distinct tubercle near apical third; mid and hind spurs piceous, pubescence entirely pale, rather copious and dense on face below ocelli, around wing bases and lateral margins of propodeum, otherwise rather thin and short, discal pubescence of abdominal terga extremely short and inconspicuous, hardly evident, but tending to form thin and very obscure, apical fasciae on terga 4 and 5; punctures rather deep and distinct, slightly separated on vertex, becoming densely crowded below ocelli, rather coarse and distinct on cheeks below, rather fine and densely crowded over most of scutum, punctures of scutellum somewhat coarser and distinctly separated, interspaces shining; pleura dull, with densely crowded punctures, these becoming slightly more coarse and distinct just below tegulae; propodeum somewhat shining, punctures fine, irregular and obscure on lateral faces, finer and more distinctly separated on posterior face, dorsal area dull above, margin narrowly striate; sternum 2 broadly produced apically, slightly emarginate medially, largely covering 3 and 4, apical margin of 3 rather broadly emarginate, this area occupied by elongate setae which converge along midline, apical margin of 4 slightly thickened and rather deeply grooved, 5-8 entirely retracted, submembranous; genital armature much as shown (see fig. 35).
DISTRIBUTION — This is primarily western, ranging from British Columbia and California to North Dakota and Texas. Collections have also been made in the East, with positive records in Michigan, New York and Florida, May to August, but as early as March in Florida.