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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 known from only one female and when better known it may possibly prove to be a race of rhois. It differs from rhois in having the abdomen entirely dark and the pygidial plate acute at apex. The difference in structure of this plate probably has specific value.
Female.—Head and thorax dark blue-green. Mandibles except red tips, and clypeus, creamy white; disk of clypeus with two broad brown stripes widening and becoming confluent above. Labrum testaceous. Thorax dark, except for creamy white collar of pronotum and tubercles, Abdomen whitish, pygidial plate testaceous. Legs whitish; apex of front femora, spot at apex of middle femora on posterior side, front tibiae and tarsi on anterior side, middle tibiae and basitarsi beneath and on posterior sides, creamy white or whitish. Antennae almost entirely dark and blackish. Tegulae testaceous hyaline, with, white spot at base. Wings hyaline, nervures testaceous, subcosta and margins of stigma slightly brownish
Head somewhat broader than long; inner orbits of eyes subparallel. Proboscis moderately short, apex of galeae falling a little short of base of stipites in repose. Mandibles normal, with a small inner tooth. Facial foveae slender, about their own width from margin of eyes and extending from upper level of antennal sockets but little more than halfway to level of anterior ocellus. Venation of wings much as in rhois, but marginal cell more rounded at apex and part beneath stigma much longer than part beyond, but less so than in rhois. Pygidial plate somewhat longer than wide at base and acute at apex. Head and thorax distinctly but rather delicately tessellate and moderately shining, and without distinct puncturation except on sides of lower face and on clypeus, where punctures are sparse. Pubescence whitish, thin, and short: hair ofmesonotum fine and erect, that of underside of head and thorax longer and denser. Length: 4.6 mm.; anterior wing, 3.3 mm.
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