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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.
Male.—Head and thorax dark blue-green, the checks, pleura, and propodeum blue, the disk of mesoscutum and the scutellum black. Clypeus and narrowly transverse lateral marks white, the clypeus with a black mark not quite covering the rounded upper half of disk. Mandibles and labrum testaceous, the tips of the former reddened. Thorax entirely dark. Abdomen black, the apical depression of tergites whitish hyaline. Antennae blackish, the flagellum dull brown beneath. Legs black, the tarsi brown. Tegulae testaceous hyaline, with a dark base. Wings whitish hyaline, the nervures whitish, subcosta and margins of stigma brown.
Head large, much broader than thorax, the inner orbits nearly parallel. Cheeks very broad, convex, with rounded outline, and about twice as broad as the eyes. Mandibles stout, tapering in the apical third to the acute apex and reaching the far margin of the broad proboscidial fossa. Facial foveae faint, a little longer than wide. Abdomen depressed, broader than thorax. Subgenital plate nearly four times longer than wide and slightly expanded on the apical third. Aedeagus most closely resembling the same parts of amoena, the caulis deeply impressed above at apex to form two opposed plates; the parameral lobes very broad at middle and narrowed slightly more than two thirds to the truncate apex; fused part of sagittae with an oval expansion beyond the apex of the broad volsellae. Length, about 4 mm.; anterior wing, 3.1 mm.
Female.—Dark blue-green, the propodeum blue, the mesonotum black except on anterior border of the scutum. Olypeus and transverse lateral marks white, the anterior margin of disk of clypeus and two broad submedian stripes black. Labrum and mandibles piceous, the latter red at apex. Abdomen black, with a narrowly interrupted creamy-white band on tergites 2 to 4, that on tergite 2 broadened and bent backward at outer ends, and those on tergites 3 and 4 arcuate, the last one sometimes a little abbreviated. Pygidial plate ferruginous. Legs black, with small apical joints of tarsi more brownish. Antennae blackish, the flagellum dark brown beneath. Tegulae and wings as in male, but nervures enclosing marginal cell also more or less brownish.
Head somewhat broader than long. Proboscis when retracted barely exceeding the proboscidial fossa. Mandibles ovally expanded on inner margin and acute at apex, which is weakly incurved. Facial foveae slender, close to margin of eyes, and extending from level of middle of antennal sockets a little more than halfway to level of anterior ocellus. Pygidium about twice as long as wide at base and with a moderately narrow rounded apex. Vertex tessellate, dullish, and nearly impunctate, the f rons polished and with close moderately fine punctures nearly to level of ocelli. Thorax finely tessellate, shining, the disk of mesoscutum and the scutellum polished and finely punctured, the punctures close on anterior border of scutum and widely spaced on the disk. Head and thorax with abundant erect white hair, which is moderately long on mesonotum and finely mosslike. Abdomen with a very short appressed sericeous pubescence on disk of tergites 2 to 4, the hair of apical fimbria long, white, and mosslike. Length, about 5 mm.; anterior wing, 3.2 mm.
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