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 5-6 mm.; head, thorax and legs entirely black, abdomen black, with small, cream-colored maculations; face slightly longer than distance between eyes above; eyes somewhat convergent below; lateral ocelli much nearer margin of vertex than to each other and nearer each other than to eyes; clypeus slightly convex, apical margin with a very slight angle on each side of center; mandibles 3-dentate, middle tooth slightly nearer apical tooth than to inner angle; cheeks subequal to eyes in width; transverse carina of prothoracic tubercles very low and inconspicuous; tegulae rather sma1l, shining, finely and rather closely punctate; wings subhyaline, veins brownish-testaceous; tibiae not spinose apically; spurs pale yellowish; pubescence entirely pale, short, rather copious over head and thorax, very fine and inconspicuous on abdominal terga; punctures quite coarse, deep and distinct, close in general over head and thorax, crowded below antennae, more distinctly separated but still close on scutum, scutellum and pleura, somewhat finer on abdominal terga; apical margins of terga 2-5 very narrowly yellowish-hyaline and impunctate, terga 1-3 with widely separated, lateral, whitish or pale yellowish maculae, 4 and 5 with a pair of more median, very small spots, sometimes with a very small, lateral spot in addition; tergum 6 very broad and short, fully twice as broad as the median length, apical margin broadly angulate, punctures very close, becoming densely crowded across apical margin; abdominal sterna closely, deeply and distinctly punctate, punctures becoming finer and more densely crowded on the more apical sterna, apical margins of 2-5 with a quite dense, apical, greyish fascia.
MALE—Length 6-7 mm.; head, thorax and legs entirely black, abdomen black, with lateral, yellowish maculations; face slightly longer than distance between eyes above; eyes somewhat convergent below; lateral ocelli nearer margin of vertex than to each other and slightly nearer each other than to eyes; clypeus quite strongly convex, apical margin slightly and rather broadly produced medially; mandibles 3-dentate, middle tooth about equidistant from inner and apical teeth; cheeks subequal to eyes in width; transverse carina of prothoracic tubercle very low and inconspicuous; tegulae rather small, shining between rather coarse, deep and distinct punctures; wings subhyaline, veins testaceous; front and mid tibiae with very short, barely evident apical angles, these not evident on hind tibiae; spurs pale yellowish; pubescence entirely pale, rather short but quite copious over head and thorax, very short and inconspicuous on abdominal terga; punctures quite coarse, deep and distinct, close in general over head and thorax, slightly separated only over posterior half of scutum, rather fine and close, quite deep and distinct on abdomen; terga 2-5 with very narrow, yellowish-hyaline, impunctate, apical rims; terga 1 and 2 with rather large and conspicuous, widely separated, lateral, pale yellowish maculations, those on 3 more elongate and transverse but still widely separated, 4 and 5 with a pair of submedian but slightly separated, transverse, yellow marks, 6 and 7 without maculae, with coarse, crowded punctures; abdominal sterna 1-3 exposed, black, rather conspicuously whitish fasciate apically, sternum 2 slightly protuberant near middle, punctures quite coarse, deep, distinct and close, 4-8 retracted, 4 with a median, circular, depressed area at apex of which is a rather narrow apical comb, remaining sterna as shown (fig. 14); genital armature much as in costalis (fig. 13).
DISTRIBUTION—North Dakota to Ontario and Maine, south to Georgia, March to July.
FLOWER RECORDS—Chrysanthemum and Rubus. Recorded by Robertson (1929) on Apocynum, Cerastium, Coreopsis, Erigeron, Geranium, Krigia, Potentilla, Rhus and Zizia.
HOSTS—(Alcidamea simplex) Robertsonella simplex (Cresson) ; Hoplitis pilosifrons and H. producta.
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