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 new species as well as the preceding is very similar to chamaesarachae, but the maxillary palpi are four-jointed, with each joint longer than the single joint in chamaesarachae. It is so far known only from the Colorado Desert of California, where it visits the flowers of Physalis crassifolia.
Female.—Head and thorax blue-green, the propodeum more bluish, the supraclypeal area black. Base of mandibles, clypeus, and triangular lateral marks white; disk of clypeus with usual pair of dark dots and two submedian brown stripes; lateral marks a little broader than high and reaching a point on orbits about halfway between level of summit of clypeus and antennal sockets. White mark of mandibles reaching middle except on the margins, the color otherwise rufotestaceous. Labrum brown. Collar of pronotum, mark on each side of hind margin of disk, and tubercles yellowish white. Abdomen ferruginous, with basal half of tergite 1 suffused with fuscous. Legs fuscous, the apex of front femora, front tibiae and tarsi and extreme base of middle tibiae pale yellow, the middle tarsi yellowish brown. Antennae brown, becoming yellowish brown beneath, but the scape white except a spot above at apex. Tegulae hyaline and yellowish white at base. Wings whitish hyaline, strongly iridescent, the nervures pale testaceous, the subcosta and margins of stigma brownish.
Head rotund, as long as wide. Mandibles rather long and tapering to the acute apex. Proboscis moderately long and a little exceeding the proboscidial fossa. Facial foveae about as in chamaesarachae, lying close to eye margin below, more removed from eye margin at upper end, and not much longer than half the space between antennal sockets and anterior ocellus. Marginal cell about four fifths as long as the first submarginal, with the part beyond stigma tending to be a little longer than the part beneath. Pygidial plate smooth, longer than wide, with the narrow apex distinctly notched. Sculpture and pubescence as in chamaesarachae. Length, 4-4.5 mm.; anterior wing, 2.8-3 mm.
Male.—Head and thorax dark blue. Mandibles except tips, labrum, clypeus, lateral, supraclypeal, and subantennal marks white, with blue of frons extending below antennae on each side and lower end of subantennal plates more or less dark. Collar of pronotum and apex of tubercles whitish, but usual marks on hind margin of disk evanescent or absent. Abdomen ferruginous, with tergite 1 dusky. Legs fuscous, the front and middle trochanters, apex and anterior margin of front femora, front tibiae, front and middle tarsi, anterior side of middle tibiae, and extreme apex of middle femora pale yellowish. Antennae brown, the flagellum paler beneath, the scape white except a brown streak above. Tegulae and wings as in female.
Head as broad as long. Labrum about twice as broad as long and strongly emarginate at apex. Mandibles acute at apex and reaching far margin of proboscidial fossa. Facial foveae about twice as long as wide, and oblique to margin of eyes. Sculpture and pubescence about as in female, but prescutellar band of hair evanescent. Subgenital plate narrowly triangular, with the apex rounded. Genitalia very similar to the parts in chamaesarachae, but the parameral lobes much less deeply emarginate at apex, with the lobe on inferior margin short and narrow; sagittae broader and more obtuse at apex. Length, 3-3.75 mm.; anterior wing, 2.5-2.9 mm.