Reprinted with permission from: Mitchell, T.B. 1960 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 141. |
FEMALE—Length 5-7 mm.; black; pubescence whitish, extremely short and thin throughout, barely evident except around tubercles, pronotum and on pleura and propodeum; length and breadth of head equal; clypeus slightly convex, projecting about one half below suborbital line; cheeks very slightly narrower than eyes; lateral ocelli much nearer margin of vertex than to eyes; face above antennae rather dull, punctures very fine and quite close, those below antennae more distinct but still quite close, supraclypeal area rather dull and tessellate, lateral areas more shining, the clypeus finely and very closely punctate above, becoming coarsely and sparsely so apically; area between eyes and ocelli shining, punctures very fine but quite distinct, vertex medially rather dull, cheeks somewhat shining and obscurely punctate above, becoming very finely striate below; scutum somewhat shining, punctures very fine but rather deep and distinct, well separated in center of disc, becoming rather close but not crowded laterally, scutellum shining ,very sparsely punctate on each side of a very slight, median impression which is finely punctate; pleura rather smooth, with obscure, irregular punctures; dorsal area of propodeum rather finely but regularly striate basally, the striae not reaching posterior margin which is smooth and rounded, posterior face somewhat shining, the lateral carinae divergent, not attaining dorsal surface; wings subhyaline, veins brownish-testaceous, stigma more definitely brownish; tegulae testaceous, with a more nearly hyaline anterior margin; legs dark, except for the somewhat reddened apical tarsal segments, hind basitibial plate small, obscure, subtriangular; abdominal terga somewhat shining, punctures exceedingly minute and indistinct, irregularly scattered on basal tergum, becoming quite sparse apically on the more apical terga, basal fasciae hardly evident, and discal pubescence very short, sparse and obscure.
MALE—Length 5 mm.; black, the labrum, mandibles and apical half of clypeus pale yellow; pubescence whitish, very short and thin on thorax, but rather dense on face; head slightly longer than broad; clypeus narrow, only slightly convex, projecting hardly at all below suborbital line; eyes quite strongly convergent below; mandibles rather short, simple, reddened apically; labrum with a rather strong, median tubercle, apical margin straight; cheeks somewhat narrower than eyes; lateral ocelli considerably nearer eyes than to margin of vertex; basal segment of flagellum subequal to pedicel in length, the following segments short, only slightly longer than broad; face above antennae somewhat shining beneath the pubescence, punctures rather deep and distinct but very fine, face below antennae densely tomentose, the punctures being obscured; area between eyes and ocelli shining, punctures rather widely separated, vertex medially rather dull, upper portion of cheeks somewhat shining and obscurely punctate, becoming microscopically striate below; scutum shining, punctures very fine but rather deep and distinct, well separated but hardly sparse in center, becoming rather closely and very minutely punctate laterally, scutellum polished, with quite sparse, minute punctures; pleura somewhat shining, with fine, obscure punctures; dorsal area of propodeum with a few short, basal striae, posterior margin rounded and rather smooth but not shining, posterior face somewhat shining, the lateral carinae divergent, not attaining dorsal margin; wings subhyaline, veins testaceous, stigma more brownish; tegulae yellowish-hyaline; legs somewhat reddened basally, tibiae yellowish in part, but mid and hind tibiae with dark median blotches, tarsi entirely pale yellow; abdominal terga shining, punctures exceedingly minute, very sparse and obscure on basal tergum, becoming somewhat more close and distinct on terga 2 and 3, sparse and minute on the more apical terga, basal fasciae inevident, discal pubescence very thin and inconspicuous, entirely pale; apical margin of sternum 5 straight, 6 broadly rounded; gonostylus small, slender, rounded apically, clothed with a few inconspicuous hairs, the ventral, retrorse lobe slender, partially clothed with very fine, short pubescence (as in foxii, fig. 90).
DISTRIBUTION—New Brunswick to Minnesota, south to Georgia and Alabama; April to September.
FLOWER RECORDS—Barbarea, Houstonia, Hydrangea, Melilotus, Prunus, Rubus, Solidago and Taraxacum. Robertson (1929) records this species (as 4-maculatus) on the following: Arabis, Aster, Blephilta, Caulophyllum, Chaerophyllum, Circaea, Elusia, Gillenia, Hydrophyllum, Isopyrum, Monarda, Osmorrhiza, Ranunculus, Salix, Sanicula, Smilacina, Staphylea, Stellaria, Symphoricarpus, Taenidia, Tradescantia, Viburnum and Zizia. Brittain and Newton (1933 and 1934) record it also on Brassica, Epilobium and Trifolium.