Extracted from: Timberlake P.H., (1962). 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 V. University of California Publications in Entomology Editors, Volume 28, No. 1, pp. 1-124.|
This species is similar to snellingi, but the head and thorax of the female are polished and the yellow on the face of the male extends straight across on the frons above the antennae
Female.—Head and thorax dark green; clypeus, disk of mesoscutum, and scutellum, black. Mandibles except red tips, collar of pronotum, and tubercles, yellow. Abdomen blackish with a broad, even, and enclosed, pale-yellow band at base of tergites 2 to 5, with that on tergite 2 abbreviated. Legs fuscous; front and middle knees, front tibiae, anterior side of middle tibiae, and all tarsi, yellow. Antennae fuscous above, more tinged with brown toward apex, clear yellow beneath on scape and pedicel, and yellow tinged with brown beneath on flagellum. Tegulae nearly clear hyaline, with yellow base. Wings slightly whitish hyaline, nervures pallid, margins of stigma and subcosta pale brownish.
Head about as broad as long, with a large, convex, prominent clypeus as in snellingi. Mandibles strongly convex on outer side, concave within, and oblique at apex. Proboscis not exceeding fossa in repose. Facial foveae somewhat wider than interval between them and eyes and reaching from upper level of antennal sockets halfway to level of anterior ocellus. Pterostigma almost evenly rounded beneath and about as wide as first submarginal cell; part of marginal cell beneath stigma longer than part beyond it, its apical truncation subequal to, or somewhat longer than, the metacarpus. Pygidial plate about as in snellmgi, but with apex a little more definitely truncate. Head and thorax shining, clypeus, disk of mesoscutum, and scutellum polished, and other parts weakly tessellate; puneturation very fine and sparse on each side of clypeus and on anterior part of mesoscutum, and moderately close on anterior half of frons. Pubescence white, erect, and about as in snellingi; hair of mesonotum rather short and coarse. Length: about 4.5-5 mm.; anterior wing, 3.1-3.3 mm.
Male.—Head and thorax dark green; undersurface of head, anterior half of cheeks, mandibles except red tips, face to level of middle of frons, pronotum except a broad dark band on disk (with a short spur in crease of flanks), prosternum, middle of mesopectus, and anterior margin of mesosternum broadly to level of tubercles, bright yellow. Antennae and legs entirely yellow. Abdomen yellow; tergite 1 and broad preapical band on four following segments brown; band on tergite 2 reaching lateral margins and nearly enclosing the yellow, other bands more abbreviated. Tegulae and wings as in female, except subcosta and margins of stigma considerably darker; wings but slightly dusky in comparison with snellingi.
Head broader than long and a little wider than thorax. Cheeks evenly rounded beneath and not equaling width of eyes. Face below antennae strongly convex, disk of clypeus about twice as broad as long. Mandibles tapering to acute apex from moderately large basal expansion (the latter smaller and less quadrate than in snellingi), and reaching a little beyond far margin of proboscidial fossa. Antennae strongly clavate, with most joints of flagellum much broader than long. Facial f oveae punctif orm. Head and thorax polished and almost impunctate. Pubescence whitish, thin except on cheeks, face almost nude, sparse hair of mesonotum longer and much finer than in female. Tergite 7 narrowed to the truncate apex as in snellmgi. Subgenital plate barely longer than wide, sides slightly incurved, apex rounded; pubescence short, thin, and mostly restricted to apical margin of disk. Aedeagus more as in subfasciata than as in snellingi, with, dorsal lobes of caulis reaching level of middle of parameral lobes, and sagittae less broadened and less angulate at broadest part as seen from above. Length: 3-3.5 mm.; anterior wing, 2.4-2.5 mm.