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Extracted from: Timberlake P.H., (1969). A Contribution to the Systematics of North America Species of Synhalonia (Hymenoptera, Apoidea). University of California Publications in Entomology Volume 57
The male of illinoensis continues to be the only sex known for this species.
Male.—Black; tibial spurs testaceous; small joints of tarsi ferruginous; apical half of claws piceous. Labrum, clypeus, and narrowly transverse supraclypeal mark pale yellow; clypeus en¬tirely light except for subtriangular notch on each side, but mark well separated from eyes, as oculoclypeal space is rather wide. Tegulae dark amber, more fuscous toward base. Wings almost uniformly dusky, with a brownish tinge, nervures dark ferruginous, subcosta black. Pubescence moderately dense and pale ochreous, paler on face beneath and on tergite 1. Hair of abdomen beyond tergite 1 almost entirely very short, suberect, not concealing surface, and entirely black, except for dark ferruginous hair across apex of tergite 6 and on each side of tergite 7, and sometimes with hair partly white across base of apical depression of tergites 2 to 4. Hair of venter black, or slightly tinged with ferruginous, and hair on sternite 1 and on each side of sternite 2 sometimes pale ochreous or whitish. Hair of legs whitish, ferruginous on inner side of tarsi.
Head much broader than long; inner orbits distinctly divergent above. Vertex very slightly impressed on each side; lateral ocelli slightly farther from nearest eye than their distance apart. Antennae rather short, not reaching beyond tergite 1, flagellum moderately compressed and nodose; joints 2 and 3 together nearly as long as scape, and joint 3 one-half as long as joint 4. Clypeus moderately shining, strongly convex, with fine, close, shallow punctures. Mesonotum dull, the scutum with dense, small, rather shallow punctures becoming a little separated on posterior middle of disk; scutellum densely punctured. Abdomen shining, with minute, almost dense punctures ; apical depression of tergites broad and punctured, except very narrowly on apical margin. Sternite 6 shining, with patch of short, fine, erect hair on each side of base; apex broadly rounded; submarginal ridge on each side low but distinct, almost rectangularly elbowed, with distal part diverging mesad from margin, and proximal part forming boundary of small lateral impression. Sternites 7 and 8 as figured. Parameral lobes of genital armature almost straight or non-arcuate, constricted on middle half, with apex evenly expanded but having inner corner much more rounded than outer corner; vestiture confined mostly to basal half and very short and thin. Length about 12-15 mm, anterior wing 8.75-10 mm, width of abdomen 5.2-5.5 mm.
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