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.|
This species is closely allied to cleomellae but differs in the details of markings and sculpture and in the very distinctive male genitalia.
Female.—Head and thorax dark green, more yellowish and less bluish green than in cleomellae. Mandibles except red tips, labrum, clypeus, and lateral marks creamy white, the subantennal plates and supraclypeal area black, rarely with two small supraclypeal spots; lateral marks triangular, less than twice as high as wide and intruding acutely between foveae and margin of eyes. Disk of pronotum and tubercles yellow, the flanks mainly dark, with a greenish tinge. Abdomen yellow, with three narrow brown or pale fuscous bands at junction of tergites 1-2 to 2-3 and at apex of tergite 3; third band much abbreviated and sometimes evanescent or absent. Legs yellow, the hind tibiae and tarsi brownish or pale fuscous, except base of tibiae and more or less of the basitarsi. Scape entirely and underside of pedicel clear pale yellow, the antennae otherwise fuscous above and brownish yellow beneath. Tegulae pale yellow at base and hyaline on outer margin. Wings whitish hyaline, the nervures and stigma pale yellowish.
Head distinctly broader than long. Mandibles moderately stout, the inner margin with a weak dilation which ends in a distinct inner tooth. Facial foveae broad and well impressed, occupying about one third of space between eye and adjacent antennal socket, and extending from level of antennal sockets about two thirds of distance to level of anterior ocellus. Pygidial plate about as long as wide at base, with nearly straight sides and a narrow, finely notched apex. Prons tessellate and shining about as in cleomellae, but with more distinct and more numerous, although still sparse punctures, which are well distributed except on the lower middle part of disk. Mesonotum polished, with rather close fine punctures. Pubescence white, moderately dense as usual in allied species, with hair of frons and mesonotum much better developed than in cleomellae; prescutellar band on mesoscutum distinct. Length, about 4-4.75 mm.; anterior wing, 2.8-3.1 mm.
Male.—Head and thorax dark blue-green. Mandibles except tips, labrum, face below level of antennae, anterior end of cheeks, and postorbital line nearly to middle of eyes yellow. Pronotum with a green band, more or less uniformly and moderately wide and enclosed by yellow except sometimes at posterior middle of disk. Posterior median notch of prosternum margined with yellow adjacent to the coxae. Abdomen yellow, with four dark bands including one at base of tergite 1; fourth band sometimes pale brown and evanescent, or reduced to a subapical mark on each side of tergite 3; yellow band on tergite 1 moderately wide and interrupted medially, or sometimes much broadened mesad and interrupted by the dark median crease. Legs including coxae yellow, the hind tibiae with a faint brownish blotch on outer margin. Antennae yellow, with a spot on pedicel and flagellum above rather narrowly brown, except the two terminal joints, which are nearly all brown. Tegulae and wings as in female, except that the nervures are darker, with subcosta and margins of stigma brownish
Head subrotund, a little broader than long. Mandibles slender, tapering, and reaching far margin of proboscidial fossa. Facial foveae punctiform and hardly longer than wide. Frons strongly tessellate, moderately dull, and with sparse obscure punctures. Mesonotum polished, with fine, remotely scattered punctures, which become more widely separated on middle of the scutum. Pubescence nearly as in the female, rather short, thin, and erect on mesonotum.
Subgenital plate nearly twice as long as wide, narrowed from base to apex, which is slightly rounded. Mediodorsal lobes of caulis small, short, and truncate; parameral lobes unusually long for this group, oval in outline and with the inner surface fully exposed in dorsal view; fused body of sagittae very slender, about six times longer than wide and tapering to the acute apex. Length, 3.5-4 mm.; anterior wing, 2.5-2.9 mm.