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 8-9 mm.; black; pubescence yellowish-white, rather copious on head above and sides of thorax; head very slightly broader than long; clypeus slightly convex, projecting about two-thirds below suborbital line; eyes very slightly convergent below; cheeks subequal to eyes in width; lateral ocelli subequally distant from eyes and edge of vertex; punctures fine but close and deep above antennae, becoming very sparse below antennae, on supraclypeal area and on clypeus apically, somewhat closer on upper margin
clypeus, punctures on vertex and upper portion of cheeks minute and indistinct, cheeks shining below, with a few scattered, sparse, coarse punctures; scutum rather dull, punctures scattered irregularly over the central area, becoming quite close laterally, shallow and in distinct anteriorly, scutellum sparsely punctate on each side of a shallow, median impression; pleura finely rugose; dorsal area of propodeum densely tessellate apically, very finely and obscurely striate basally, posterior face rather densely pubescent, without lateral carinae; wings faintly infuscated, veins and stigma ferruginous; tegulae ferruginous to piceous, with a yellowish-hyaline anterior border; legs quite uniformly dark, hind basitibial plate triangularly pointed; abdominal terga rather dull, basal tergum minutely and very closely punctate, the following terga successively more minutely and obscurely punctate, terga 2-4 with broad, dense, yellowish- white, basal fasciae, that on 4 usually hidden, discal pubescence very short and thin, more brownish in color.
MALE—Length 8 mm.; black, apical two- thirds of clypeus whitish; head very slightly broader than long (resembling athabascense, fig. 86); clypeus rather flat, projecting about one-half below suborbital line; eyes slightly convergent below; mandibles slender, rather elongate, but tip not nearly reaching base of the opposite one; labrum broadly triangular, sub acute medially; cheeks subequal to eyes in width; lateral ocelli very slightly nearer margin of vertex than to eyes; basal segment of flagellum slightly longer than pedicel, second and following segments only slightly exceeding this length, brownish-piceous beneath, blackish above; punctures of face above antennae close, deep, fine and distinct, becoming more obscured by pubescence below on each side, but supraclypeal area bare, with distinct, well separated punctures, clypeus smooth, largely impunctate except for upper margin; punctures of vertex obscure, cheeks becoming very finely, obscurely rugose above, distinctly striate below; scutum shining, punctures quite deep and distinct, well separated in center of disc, becoming quite close laterally, those on scutellum very sparse on each side of a median, more closely punctate impression; pleura finely rugose; dorsal area of propodeum smooth and shining posteriorly, with obscure, fine striations toward base, posterior face thinly pubescent, with only short, marginal carinae below; wings very lightly infuscated, veins and stigma ferruginous; tegulae yellowish-ferruginous, becoming hyaline anteriorly; basal segments of legs dark, tarsi entirely yellowish; basal abdominal tergum closely and finely, but quite deeply and distinctly punctate, punctures on following segments becoming progressively more minute and indistinct, surface somewhat shining, terga 2-4 with rather dense, white, basal fasciae, that on 4 more or less hidden; apical margin of sternum 5 relatively straight, 6 rather narrowly subtruncate apically; gonostylus slender and elongate, sparsely clothed with fine setae, the ventral retrorse lobe narrow, attenuated apically, clothed with fine pubescence which becomes more elongate apically.
DISTRIBUTION—Washington to New Brunswick, south to Texas and Georgia; April to September.
FLOWER RECORD S—Antennaria, Apocynum, Barbarea, Brassica, Houstonia purpurea, Koellia, Melilotus, Rhus, Rubus, Salix, Taraxacum and Vaccinium. Robertson (1929) records this species on the following additional genera; Amorpha, Asclepias, Aster, Camassia, Capsella, Ceanothus, Cercis, Cornus, Diospyros, Erigenia, Eryngium, Gerardia, Isopyrum, Lepachys, Monarda, Osmorrhiza, Oxalis, Pastinaca, Rhammus, Solidago, Symphoricarpus and Tilia.