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Extracted from: Timberlake P.H., (1958). A Revisional Study of The Bees of the Genus Perdita F. Smith, with Special Reference to the Fauna of the Pacific Coast (Hymenoptera, Apoidea) Part III. University of Caifornia Press Berkeley and Los Angeles 1958, Volume 14, No. 5, pp. 303-410, plates 4-15
P. nigrocincta is similar to punctifrons in the strongly punctured frons, but differs in the more massive mandibles, shorter and more oval facial foveae, smaller and more straightly margined pygidial plate as well as in the markings.
Female.—Head and thorax dark yellowish green. Mandibles except red apical third, labrum, clypeus, and lateral marks creamy white; disk of clypeus with traces of brown submedian stripes as well as usual pair of dark dots. Lateral marks shaped about as in punctifrons. Subantennal plates and supraclypeal area black. Abdomen creamy white, with five sharplydefined black bands, including one at base of tergite 1; that at junction of tergites 4-5 with a slight anterior bulge on each side; the light band on tergite 1 moderately narrow and interrupted only by the dark median crease. Legs pale yellow, the posterior side of middle tibiae, spot at apex of hind femora, and the hind tibiae and tarsi dilute fuscous or brownish. Antennae brownish fuscous above, the fiagellum dull yellowish beneath, the scape clear yellowish white, except a large apical fuscous mark above. Tegulae subhyaline, with basal margin yellow. Wings clear hyaline, the nervures uniformly pale testaceous, with the stigma whitish except margins. Head large and broad, but hardly broader than long, the face much less convex than in punctifrons, with disk of clypeus broader than high and broadly rounded above. Mandibles massive, strongly curved, subdilated within, with the dilation ending in a distinct inner tooth. Facial foveae well impressed, somewhat less than half their width from margin of eyes, shorter and more oval than in punctifrons, and extending a little more than halfway to level of anterior ocellus. Pygidial plate about as long as broad at base, with the sides converging in a slightly convex curve to the moderately narrow and notched apex. Sculpture and pubescence about as in punctifrons, except that the punctures of frons are slightly coarser and closer and the tessellation somewhat rougher. Length, about 6 mm.; anterior wing, 4.1 mm.
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