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 13-16 mm.; entirely
black, including tegulae and legs; face considerably longer
above; eyes slightly convergent below; facial prominance low medially, strongly protuberant at each side; clypeus smooth, shining, with rather fine, sparse but distinct punctures, apical margin straight, with a quite prominant fringe of long greyish hairs; cheeks much broader than eyes; lateral ocelli subequally distant from eyes and margin of vertex, slightly nearer each other; mandibles 3-dentate, middle tooth rather prominant; labrum with a basal, transverse process, which has a slight median, and a pair of lateral, emarginations; pubescence of head entirely pale, rather copious around antennae and down inner orbits, quite long and copious on lower part of cheeks; punctures fine and close on face above antennae and on vertex, becoming rather sparse above each eye and more shallow and indefinite along cheeks, becoming rather coarse and close below; scutum dull, finely and densely rugose, becoming almost reticulate anteriorly, scutellum finely rugose except along posterior margin; pleura distinctly but finely and closely punctate; propodeum smooth but rather dull; tegulae smooth, with some minute and close punctures anteriorly; wings subhyaline, veins and stigma piceous, recurrent veins entering 2nd submarginal cell subequally distant from base and apex; hind tibiae coarsely spiculate on outer surface, mid tibiae more finely so, and front tibiae more punctate than spiculate; spurs pale yellowish; legs largely pale pubescent, but mid basitarsi with some blackish hairs beneath apically, and hind basitarsi with prominant, erect, black, seta-like hairs; abdominal terga 1-3 shining and practically impunctate medially, becoming finely, closely and quite distinctly punctate toward sides, terga 4-5 more distinctly punctate medially, punctures of 5 quite deep, distinct and relatively coarse; terga 2-5 with whitish, apical fasciae, these widely interrupted on 2, somewhat less so on 3, entire on 4, and entire and conspicuous on 5; discal pubescence extremely short and inconspicuous on the more basal terga, becoming quite distinct but very short on tergum 5 where it is largely black, tergum 6 with a dense covering of fuscous pubescence which completely hides the surface except for the median, apical spine; scopa pale yellowish, with a few black hairs on sternum 5; sterna 1-5 with narrow but entire, whitish, apical fasciae, discs with rather coarse, well separated but hardly sparse punctures, these becoming relatively close and fine on the basal sterna, sternum 6 triangular, with a narrow, impunctate, median line, closely and deeply punctate on each side.
MALE—Length 10-13 mm.; entirely black, including tegulae and legs; face somewhat longer than distance between eyes above; eyes slightly convergent below; supraclypeal area slightly elevated but hardly protuberant; clypeus slightly convex, apical margin straight, quite strongly thickened medially; lateral ocelli subequally distant from margin of vertex and each other, slightly more distant from eyes; cheeks considerably broader than eyes; mandibles 3-dentate, middle tooth acute and prominant; labrum with a pair of basal, erect, spine- like tubercles, rather deeply excavated between them; pubescence of head entirely pale, rather copious around antennae and along apical margin of clypeus, quite elongate and copious on cheeks, especially below; punctures very close, fine and rather indistinct on vertex medially and on cheeks, becoming much more coarse, deep and distinct between eyes and ocelli and toward antennae, supraclypeal area shining and very sparsely punctate, clypeus with a median, rather sparsely punctate area but becoming densely rugoso-punctate on each side; scutum and scutellum finely and densely rugoso-punctate throughout, pleura with fine, densely crowded punctures, almost rugose; propodeum smooth and somewhat shining, punctures very shallow, fine and indefinite; tegulae smooth and somewhat shining, becoming minutely and closely punctate anteriorly; wings subhyaline, veins and stigma piceous, recurrent veins entering 2nd submarginal cell subequally distant from base and apex; front and mid tibiae rather coarsely and closely spiculate over anterior half, hind tibiae more rugose than spiculate; pubescence of legs largely pale, rather long and copious, but hind basitarsi with a few black hairs apically; spurs pale yellow; thoracic pubescence whitish in large part, somewhat more ochraceous on scutum, quite dense and elongate laterally and below; abdominal terga somewhat shining, very minutely and rather sparsely punctate medially on 1-4, these becoming rather closely and finely punctate laterally, 5 and 6 with deeper and more distinct punctures, these close laterally on 5 and very close over entire breadth of 6; terga 2-6 with whitish and quite dense apical fasciae, slightly interrupted on 2, discal pubescence pale on basal terga, becoming darker apically, conspicuous and black on terga 5 and 6, 7 with elongate, largely blackish hairs which do not hide the rather obscurely rugose surface, the plate terminated in triangular pygidium; abdominal sterna somewhat shining between rather deep and distinct punctures, these fine and close on the more basal segments, becoming somewhat more widely separated apically; genital armature and sterna 7 and 8 resembling those of gibbosus (fig. 2).
DISTRIBUTION—Mexico, through Texas to Illinois, March to June.
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