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.|
Male.—Head and thorax bluish green, the disk of mesoscutum and the scutellum blackish; a small area between bases of antennae, most of under surface of head, pronotum except the light marks, metapleura, and flanks of propodeum more or less tinged with red, or ferruginous. Base of mandibles, labrum, and face below level of antennae creamy white, but the sutures separating elypeus and other parts narrowly testaceous. Mandibles testaceous in middle and rufous at apex. Tubercles and a broad band on hind margin of disk pronotum, narrowly interrupted in middle, creamy white. Abdomen ferruginous, with a creamy-white band on tergites 1 to 5, interrupted on each side, the interruptions usually darker than the remainder of ground color, especially on basal segments, the base of tergite 1 also having the same infuscation. Antennae yellowish brown, becoming somewhat darker above, the scape whitish beneath. Legs brown, the apex of front femora, base of hind tibiae, and front and middle tibiae except beneath yellowish white. Tegulae white at base and testaceous hyaline on outer margin. Wings dusky hyaline, with dark nervures as in pelargoides.
Head nearly one and one-fourth times longer than wide, the inner orbits somewhat diverging anteriorly. Labrum unusually large. Mandibles moderately stout, tapering to acute apex, and reaching far margin of the proboscidial fossa. Proboscis moderately elongate and reaching front coxae in repose. Facial foveae very narrow and close to margin of eyes and about six or seven times longer than wide. Wings and venation as in pelargoides. Head and thorax minutely tessellate and moderately dull, the frons with close, minute indistinct punctures, the mesonotum with moderately close, fine but distinct punctures. Abdomen subdepressed and broader than the thorax. Subgenital plate and aedeagus remarkably similar to the same parts in pelargoides, but the parameral lobes of caulis more thickened toward apex. Length, 4r-4.5 mm.; anterior wing, 2.6-2.9 mm.