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 6 mm.; black; pubescence white, very short and thin, but somewhat more copious on thorax laterally; length and breadth of head equal; clypeus slightly convex, projecting about two-thirds below suborbital line; eyes somewhat convergent below; cheeks subequal to eyes in width; lateral ocelli slightly nearer margin of vertex than to eyes; face above antennae rather dull, punctures deep and distinct, rather coarse and quite close, becoming somewhat more distinctly separated, but still quite close below; clypeus with coarser and much more sparse punctures apically; area between eyes and ocelli shining, punctures finer and more widely separated, vertex medially somewhat shining, with very fine, obscure punctures; cheeks somewhat shining and obscurely punctate above, becoming quite distinctly striate below; scutum somewhat shining, punctures deep and distinct, quite close throughout, becoming almost crowded laterally, scutellum quite flat, shining, punctures irregularly scattered and variable as to size; pleura very coarsely reticulate; dorsal area of propodeum coarsely rugoso-striate, the striae becoming more regular laterally, posterior face somewhat smoother, marginal carinae complete, but widely divergent above; wings hyaline, veins and stigma testaceous; tegulae piceous, with a yellowish-hyaline anterior margin; legs dark, but becoming somewhat reddened apically, hind basitibial plate triangular, acute; abdominal terga shining, very minutely punctured, the punctures widely scattered and very sparse on basal tergum, becoming somewhat closer but more minute and obscure apically, terga 2 and 3 with basal, white fasciae evident laterally but usually obscured medially, discal pubescence barely evident, suberect, entirely pale.
MALE—Length 5 mm.; black, including all of clypeus, labrum and legs; pubescence whitish, very short and thin; length and breadth of head equal; clypeus only slightly convex, projecting about one-half below suborbital line; eyes slightly convergent below; mandibles reddened apically, simple, rather short; labrum triangular, acute but not spine-like apically; cheeks subequal to eyes in width; lateral ocelli very slightly nearer margin of vertex than to eyes; basal segment of flagellum very short, somewhat broader than long, subequal in length to pedicel, following segments also very short, somewhat brownish below, piceous above; face above antennae dull, densely and finely rugoso-punctate, lower portion of face above clypeus with somewhat more distinct but close punctures; clypeus more shining, finely and rather closely punctate above, becoming sparsely and closely punctate below; area between eyes and ocelli more shining and more distinctly punctate, vertex somewhat shining, obscurely sculptured, cheeks striate; scutum somewhat shining, punctures deep and distinct, separated by about a puncture width over most of median portion but quite close laterally, scutellum rather flat, shining, similarly punctured; pleura very coarsely reticulate; dorsal area of propodeum coarsely striate, posterior face somewhat smoother, marginal carinae rather distinct, widely divergent above; wings subhyaline, veins and stigma brownish-testaceous; tegulae piceous except for a median lighter area and the yellowish-hyaline anterior margin; legs entirely dark except for the somewhat reddened tarsal segments; abdominal terga somewhat shining, very finely and quite closely and regularly punctate, without distinct fasciae, discal pubescence very short and thin, entirely pale; apical margin of sternum 5 nearly straight, 6 rather broadly rounded; gonostylus short and inconspicuous, thinly clothed with short pubescence, the ventral, retrorse lobe broadly expanded, thinly but rather uniformly clothed with short pubescence.
DISTRIBUTION—Nova Scotia to Florida, west to Wisconsin, Nebraska and Texas; March to November.
FLOWER RECORDS — Antennaria, Apocynum, Asclepias, Barbarea, Bidens, Brassica, Ceanothus, Chichorium, Chrysanthemum, Crataegus, Daucus, Erigeron, Fragaria, Helenium, Hieraceum, Hypericum, hex, Ligustrum, Medicago, Melilotus, Oxalis, Potentilla, Prunus, Rhus, Rubus, Rudbeckia, Salvia, Senecio, Solidago, Stachys, Stokesia, Toxicoclendrum, Trifolium and Vernonia. Robertson (1929) records pectoralis on the following additional genera: Actea, Amorpha, Anemonella, Arabis, Aruncus, Aster, Blephilia, Brauneria, Cacalia, Camassia, Capsella, Cardamine, Cassia, Circaea, Cirsium, Claytonia, Coreopsis, Cornus, Cryptotaenia, Ellisia, Eryngium, Eulophus, Eupatorium, Geranium, Geum, Gillenia, Helianthus, Heliopsis, Heracleum, Houstonia, Hydrangea, Hydrophyllum, Hypoxis, Isopyrum, Krigia, Laotuca, Lepidium, Lippia, Ludwigia, Malva, Monarda, Oenothera, Osmorrhiza, Pastinaca, Polytaenia, Potentilla, Pycnanthemum, Radicula, Ranunculus, Sagittaria, Salix, Scutellaria, Silphium, Sisymbrium, Smilacina, Smilax, Sympharicarpus, Taenidia, Thaspium, Tilia, Tradescantia, Valerianelici, Verbascum, Verbena, Viburnum and Zizia. Brittain and Newton (1934) record this species also on Achillea, Diervilla, Epilobium, Leontodon, Rosa, Spergula and Stellaria.