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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 California Press Berkeley and Los Angeles 1958, Volume 14, No. 5, pp. 303-410, plates 4-15. This species is known only from Riverside, California, where it is common during late September and October at flowers of Aplopappus (Isocoma) venetus var. vernonioides. The female differs from most of the allied species in having the supraclypeal area and subantennal plates entirely black. Male.�Head and thorax dark blue-green, with bright yellow markings. Mandibles except reddish tips, labrum, clypeus, lateral and supraclypeal marks, often subantennal marks, and anterior margin of cheeks, with postorbital line nearly to middle of eyes, yellow; lateral marks much higher than wide, more or less evenly oblique from base to apex on inner side, and reaching a little above level of antennal sockets; supraclypeal mark broad and rounded above, with a small median notch, or rarely divided into two spots; subantennal marks covering almost the entire plate, but varying to small marks adjacent to the antennal sockets, or entirely absent. Pronotum green, with the tubercles, interrupted band on hind margin of disk, collar, and spot on anterior margin of flanks yellow (or anterior margin of segment almost entirely yellow). Abdomen yellow, with six or seven brown or fuscous bands, including one at base of tergite 1, but band at apex of tergite 6 often evanescent; yellow band on tergite 1 narrow, interrupted medially, sometimes evanescent or absent; yellow bands on tergites 2 and 3 rarely enclosed at outer ends and occasionally one or more of the bands slightly interrupted medially and that on tergite 2 rarely interrupted close to the outer ends. Legs yellow, with posterior side usually of all the tibiae, the hind tarsi, and sometimes a blotch on front femora, and spot at apex of hind femora above, brown. Large mark on scape, the pedicel, and flagellum above brownish fuscous, the scape and pedicel otherwise clear yellow and underside of flagellum brownish yellow. Tegulae yellow at base and broadly hyaline on outer margin. Wings faintly dusky hyaline, the nervures pale brownish testaceous, margins of stigma more fuscous, and subcosta except its apex pale ferruginous. Head usually distinctly broader than long. Mandibles rather slender, acute at apex, and reaching for margin of proboscidial fossa. Facial foveae faint and about two to three times longer than wide. Marginal cell of wings with the parts beneath and beyond stigma about equal. Frons densely granular tessellate, subopaque, with obscure minute punctures. Mesonotum polished, although sometimes faintly tessellate around the margins of scutum, and with fine remote punctures; mesopleura delicately tessellate. Pubescence whitish, of the usual density on cheeks and underparts of thorax, and thin and erect on mesonotum. Subgenital plate about twice as long as wide, with the sides rather strongly incurved and the apex truncate. Parameral lobes of caulis rather longer than in allied species, with the dorsal part of the lobes concealing the inferior part in dorsal view; volsellae protruding well beyond apex of the mediodorsal lobes of caulis; fused part of sagittae about four times longer than wide and not at all angulated before the apex. Length, 4-4.75 mm.; anterior wing, 3-3.3 mm. Female.�Head and thorax dark blue-green, the frons more yellowish green. Mandibles except red tips, labrum, clypeus except pair of dark dots, and lateral marks yellow; lateral marks more than twice as high as wide, acute, and intruding above between fovea and eye, but abruptly narrowed, or with a slight expansion, where they touch the foveae. Subantennal plates and supraclypeal area shining black. Pronotum green, the tubercles, band on posterior margin of disk, collar, line on front margin of the flanks yellow (or sometimes anterior margin of the sclerite more continuously yellow). Abdomen yellow, with five even brown or brownish-fuscous bands, including the base of tergite 1; yellow band on tergite 1 moderately wide and narrowly interrupted medially. Legs yellow, the hind tibiae and tarsi, the posterior and most of anterior side of middle tibiae brown or fuscous. Tegulae and wings as in the male, although the wings more distinctly dusky. Head distinctly wider than long. Mandibles moderately stout, with a distinct inner tooth before the apex. Facial foveae well impressed, about half their width from eye margin, and extending from slightly below level of upper margin of antennal sockets nearly two thirds of the distance to level of anterior ocellus. Pygidial plate about as broad as long, with the sides converging to the moderately narrow apex, which has a fine median notch. Frons strongly tessellate and dull, but slightly more shining on each side below, with fine and obscure punctures, which become more distinct and closer in area between each fovea and adjacent antennal socket. Mesonotum polished and remotely punctured. Pubescence whitish, very thin and erect on mesonotum, with the prescutellar band of hair thin and narrow. Length, 4-5.5 mm.; anterior wing, 3-3.5 mm. One hundred forty-six males, 103 females (holotype male, allotype, and paratypes), Eiverside, California, on Aplopappus (Isocoma) venetus var. vernonioides, except one female on Polygonumlopathifolium and a few specimens on Solidago occidentalis and Baccharis emoryi, Aug. 27 to Oct. 20 in different years. Types in collection of U. S. National Museum (No. 43,415); paratypes in collections of the University of California at Berkeley and Riverside, the University of Kansas, the California Academy of Sciences, and the American Museum of Natural History.
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