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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 mohavensis has the sixth sternite distinctively produced into a broad lobe which is strongly ridged, but I have not been able to associate it with any female.
Male.—Black; small joint of tarsi and base of claws ferruginous; apex of claws dark rufous; tibial spurs testaceous. Tegulae amber at apex and fuscous on basal half. Wings slightly dusky, nervures ferruginous, subcosta black. Labrum and clypeus pale yellow or creamy white; clypeal mark nearly reaching margin of eyes and strongly notched on each side. Sometimes a small supraclypeal spot also present. Pubescence moderately dense and long, erect, and very pale ochreous or white on head, thorax, and base of abdomen. Hair of abdomen beyond tergite 1 mostly short; a narrow band of white tomentum close to apex on tergites 2 to 6 but that on tergite 2 not distinct from short, erect discal pubescence except on each side; and bands on tergites 2 and 3 followed by line of black pubescence. Hair at extreme base of tergite 3 and broadly at base of tergites 4 to 6 black; discal hair on tergites 2 and 3 white. Hair on tergite 7 and across middle of sternites 4 and 5 pale brown, fringes on rest of venter whitish. Hair of legs white, but ferruginous on inner side of tarsi.
Head much broader than long; eyes large and prominent above, inner orbits diverging behind. Facial quadrangle slightly longer than wide. Vertex strongly impressed on each side; lateral ocelli somewhat more than their diameter from occipital margin and twice as far from nearest eye. Proboscis moderately long, galeae shining and nearly hairless. Antennae reaching about middle of tergite 1, flagellum slender, moderately compressed, joint 3 nearly twice as long as wide, and on its long side about one-half as long as joint 4. Legs normal, middle tibiae a little shorter than basitarsi. Second submarginal cell receiving recurrent nervures one-fifth to one-fourth of its length from apex. Clypeus shining, with fine, close, shallow punctures. Frons, vertex, and anterior part of mesoscutum rather dull and densely punctured; disk of mesoscutum more shining, with punctures slightly separated at posterior middle. Abdomen minutely and densely punctured, with apical depression of tergites 1 to 5 narrowly bare and impunctate. Sternite 6 with strong polished impression on each side near base, the sides then converging to short, broad median lobe which is strongly and textiformly ridged; disk mostly dullish, with short, erect hair toward base. Sternites 7 and 8 as figured. Parameral lobes of genital armature slender, slightly dilated at base, and ovally expanded at inturned tip; pubescence on outer surface rather long but thin and extending nearly to apex. Length 11-12 mm, anterior wing 8.5-9 mm, width of abdomen 4.5-5 mm.
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