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 8-10 mm.; black; pubescence whitish, rather short; length and breadth of head equal; eyes very slightly convergent below; clypeus slightly convex, projecting somewhat more than one-half below suborbital line; cheeks very slightly broader than eyes; lateral ocelli very slightly nearer margin of vertex than to eyes; punctures quite deep and distinct, rather fine and close but not crowded above antennae, becoming widely separated on supraclypeal area and on clypeus apically, somewhat closer on sides of face and upper margin of clypeus, these areas polished; punctures very close, minute and obscure on vertex medially, the cheeks becoming striate below; scutum quite dull, punctures irregularly scattered and of variable sizes in center of disc, becoming quite close laterally, scutellum rather smooth, with scattered, minute punctures, and few considerably coarser punctures; pleura finely rugose; dorsal area of propodeum quite smooth except for a short, basal fringe of fine striae, posterior face lacking distinct lateral carinae; wings lightly infuscated, veins and stigma pale ferruginous; tegulae piceous to blackish, with a yellowish-hyaline anterior rim; legs almost entirely black, hind basitibial plate rather obscure, triangularly acute; basal abdominal tergum somewhat shining, very minutely and quite closely and regularly punctate, the punctures quite distinct, following terga dull, punctures exceedingly minute, close and indistinct, terga 2-4 with rather dense, white, basal fasciae, discal pubescence extremely short and obscure, somewhat darker.
MALE�Length 7-8 mm.; black, apical half of clypeus bright yellow; pubescence whitish, rather thin, but quite copious on lower half of face and on thorax; length and breadth of head equal; clypeus short and quite broad, rather flat, projecting somewhat more than one-half below suborbital line; eyes sub parallel; mandibles slender and extremely elongate, tip of one reaching base of the other when closed; labrum transverse, very short; cheeks much broader than eyes, with a rounded ventral angle; lateral ocelli slightly nearer margin of vertex than to eyes; basal segment of flagellum somewhat longer than pedicel but shorter than the following segments which are blackish above, pale brownish beneath; punctures close, fine, deep and distinct above antennae, becoming somewhat more sparse below, clypeus with only a few very fine, inconspicuous punctures along basal margin, the apical area being entirely smooth and impunctate; vertex shining, with minute and rather widely separated punctures, cheeks becoming finely rugoso-striate above and more distinctly but still finely striate below; scutum shining, punctures deep and distinct but fine, well separated in center of disc, becoming rather close laterally, those on scutellum rather widely scattered on each side of a fine median line; pleura finely rugose; dorsal area of propodeum quite smooth except for a short, basal fringe of striae, posterior face rather smooth, with obscure punctures, without carinate lateral margins; wings subhyaline, veins and stigma pale ferruginous; tegulae yellowish-ferruginous, anterior margin yellowish-hyaline; legs dark in general; abdominal terga somewhat shining, basal segments very closely and finely punctate, punctures becoming obscure on the more apical terga, segments 2-4 with rather dense, white, basal fasciae, discal pubescence very short, thin and obscure, apparently entirely pale; apical margin of sternum 5 nearly straight, sternum 6 subtruncate apically; gonostylus rather robust and elongate, well clothed with fine setae which form a distinct, elongate, apical tuft, the ventral retrorse 1obe rather narrow, partially clothed with short pubescence.
DISTRIBUTION�Alberta to Nova Scotia, south to Illinois and Georgia; March to November.
FLOWER RECORDS�Apocynum, Aster, Barbarea, Houstonia purpurea, Hydrangea, Melilotus, Polygonum, Potentilla, Rosa, Rubus, Salvia, Solidago and Trifolium. Robertson (1929) records coriaceum (as Curtisapis coriacea) on the following genera:
Abutilon, Actinomeris, Anemonella, Arabis, Aruncus, Asclepias, Bidens, Blephilia, Campanula, Castalia, Caulophyllum, Cercis, Claytonia, Coreopsis, Cornus, Cuscuta, Diospyros, Erigeron, Eupatorium, Frasera, Geranium, Helianthus, Hydrophyllium, Hypoxis, Isopyrum, Lobelia, Lycopus, Malva, Monarda, Osmorrhiza, Pentstemon, Polemonium, Prunus, Psoralea, Ptelea, Ranunculus, Ribes, Rudbeckia, Sanicula, Scrophularia, Sium, Staphylea, Symphoricarpus, Tilia, Verbascum, Verbena, Verbesina, Veronica, Viburnum, Zizia and Zanthoxylum. A few additional records are given by Brittain and Newton (1933 and 1934) as follows: Amorpha, Brassica, Crataegus, Diervilla, Philadelphus, Pyrus malus and Rhododendron.
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