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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 may prove to be a race of isocomae when better known, but the genitalia of the male, the markings, and some other characters differ appreciably; hence it may be considered distinct until some proof of intergradation is evident. Most of the specimens of the type series have lost parts of the antennae and legs and vary considerably in the extent of the dark markings. Male.—Head and thorax dark blue-green. Mandibles, except tips, labrum, face below level of antennae, except the dark subantennal plates, and anterior end of cheeks, with a short post-orbital line, bright yellow; lateral face marks tapering, very acute above, and ending well above level of antennae. Pronotum dark, the tubercles, posterior border of disk, and line on the anterior margin of sclerite, slightly interrupted at upper end of flanks, yellow. Abdomen yellow, with six broad fuscous bands including the base of tergite 1; yellow band on tergite 1 narrow and well interrupted medially and those on tergites 2 to 5 slightly and broadly emarginate behind on each side and narrowly interrupted or deeply notched in the middle; or abdomen brownish fuscous, as in holotype, with a small subapical yellow Bpot on each side of tergite 1 and a yellow band, narrowly interrupted medially, on tergites 2 to 6. Legs yellow, but front and middle femora and tibiae behind to a greater or lesser extent, hind femora entirely, as well as hind tibiae except beneath, and hind tarsi brownish fuscous, but the femora varying to all, or nearly all, yellow. Scape of antennae and pedicel yellow beneath, the flagellum beneath dull yellow, the ■ antennae otherwise brownish fuscous, becoming paler at apex, but scape sometimes yellow above on basal half. Tegulae hyaline, with the basal margin yellow. Wings a little more strongly dusky hyaline than in isocomae, the nervures and margins of stigma brownish testaceous, the subcosta pale ferruginous. Head distinctly broader than long, the inner orbits slightly converging below. Mandibles and foveae about as in isocomae, but marginal cell of wings longer, with the part beneath the stigma somewhat shorter than the part beyond. Pubescence and scupture about as in isocomae, with the frons a little more roughly tessellate. Subgenital plate subquadrate, a little longer than wide, and broader across the base than at the truncate apex. Parameral lobes of the aedeagus shorter than in isocomae, the volsellae barely exceeding the mediodorsal lobes of caulis, and the fused part of the sagittae distinctly broader than in isocomae. Length, 4-4.5 mm.; anterior wing, about 3 mm. Female.—Head and thorax dark yellowish green, the propodeum more bluish. Mandibles except reddish tips, disk of clypeus except brown anterior margin and usual pair of dots, and lateral marks bright yellow; lateral extensions of clypeus, dorsal margin of sides of disk, and supraclypeal area black, the subantennal plates greenish; lateral marks separated below from clypeus by a dark interval, narrowed gradually to foveae and with a spur intruding between fovea and eye margin. Labrum fuscous, varying to pale brown, with a median yellowish mark. Pronotum with collar, band on posterior margin of disk, and the tubercles yellow, the band and mark on tubercles sometimes confluent. Abdomen yellow, with a fuscous band at base of tergite 1 and at junction of tergiteB 1-2 to 4-5; yellow band on tergite 1 broad and more or less broadly interrupted medially, and lateral margins of base of segment also yellow; yellow bands on following segments at most not much wider than the dark bands, and some a little notched medially or rarely narrowly interrupted; venter almost entirely yellow, but sometimes brown with a yellow band on segments 2 to 5. Legs yellow, variably marked with brown or fuscous; hind tibiae and tarsi, and posterior side of middle tibiae and middle tarsi probably always dark; coxae, trochanters, and posterior side of front tibiae dark in allotype, as well asfemora in part, but anterior side of front femora, apex of middle pair, and line on apical part of dorsal margin of hind pair, yellow. Antennae with scape and pedicel beneath bright yellow, the scape entirely dark above, or dark only at apex, and the flagellum fuscous except rather narrowly yellowish beneath. Tegulae and wings as in male. Head somewhat broader than long. Mandibles moderately stout, with a well-developed inner tooth. Facial foveae about twice as broad as interval between them and margin of eyes, and reaching from level of middle of antennal sockets about two thirds of distance to level of anterior ocellus. Pygidial plate somewhat broader than long, with the sides arcuately converging to the rounded apex, and the median notch small but rather deep. Sculpture much as in i80comae, but the punctures of f rons coarser and punctures of mesoscutum considerably closer. Pubescence pale ochreous, moderately thin, short and erect on mesonotum, and longer and denser on cheeks and underparts of thorax. Length, about 4.75-5.75 mm;; anterior wing, 3.5 mm. Three males, 5 females (holotype male, allotype, and paratype) Lompoc, Santa Barbara County, California, Sept. 9,1908 (J. C. Bradley).
Types in collection of Cornell University (No. 1,004) except three paratypes kept at Riverside.
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