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.|
Cockerell described this species from Tempe, Arizona, where he collected it from flowers of Baccharis, October 28, 1899. More recently it has been rediscovered in the Palo Verde Valley, Riverside County, California. It may be recognized by the strongly tessellate, dull, and virtually impunctate frons, and by the almost nude f rons and mesonotum.
Female.—Head and thorax dark yellowish green. Face marks creamy white, including a supraclypeal mark. Pronotum pale yellow, except a large, triangular green mark on low part of flanks, which sends a dark line to summit of tubercles; abdomen yellow, with five fuscous or blackish bands including one at base of tergite 1; yellow band on tergite 1 roundly dilated mesad on each side and interrupted by the dark median crease. Legs yellow with a small spot at apex of hind femora, the hind tibiae and tarsi brown or fuscous, and the middle tibiae shaded with brown on outer margin. Wings whitish hyaline, the nervures pale yellowish, subcosta and margins of stigma pale brown.
Head somewhat broader than long. Mandibles moderately dilated on inner margin, the dilation narrowing gradually and ending close to the apex. Facial foveae nearly as in adjuncta in shape and length, and much more distant from eye margin at lower end than above. Pygidial plate about as in adjuncta except that it is as broad across the base as long. Frons minutely, slightly roughly tessellate and moderately dull, with the punctures so sparse, minute, and indistinct that the surface is best described as impunctate. Mesonotum polished., the minute punctures distinct, but very remotely spaced. Pubescence white, of nearly the usual density except on the frons and disk of mesonotum which are nearly nude; mesoscutum, however, with a rather dense, although narrow prescutellar band. Length, about 4.5-5.5 mm.; anterior wing, 3.2-3.8 mm.
Male.—Dark, more bluish green than the female, the frons olive green. Mandibles except red tips, face below level of antennae, anterior end of cheeks, and postorbital line nearly to middle of eyes yellowish white, becoming yellower above on the face. Pronotum yellow, with a narrow green band from middle of one flank to the other, and a linear extension on each side to the tubercles. Abdomen yellow, the base of tergite 1 and bands at junction of tergites 1-2 to 4-5 brownish black, the base of tergites 6 and 7 also infuscated; yellow band on tergite 1 narrowand interrupted medially, those on tergites 2 and 3 narrowed and bent backward at outer ends, and those on tergites 2 to 4 slightly emarginate behind on each side from the broad bulges in the subsequent dark bands. Legs, including coxae, yellow with hind tibiae and tarsi, except underside of the tibiae and basitarsi, pale fuscous; a small dark spot at apex of hind femora evanescent or absent. Scape and underside of pedicel pale yellow, the flagellum brownish yellow beneath, the flagellum and pedicel otherwise and spot at apex of scape fuscous. Tegulae yellow at base and hyaline on outer margin. Wings almost clear hyaline, the nervures pale brown, subcosta and margins of stigma somewhat darker brown.
Head rotund> barely broader than long. Mandibles slender, acute, and reaching far margin of proboscidial fossa. Facial foveae almost punctiform and faint. Frons minutely, somewhat roughly tessellate and dull, but not opaque, and virtually impunctate. Mesonotum polished and very remotely punctured. Pubescence as in female. Mediodorsal lobes of caulis subacutely produced and dorsal side of the parameral lobes small and exposing most of the inferior part in dorsal view; sagittae narrowed from only a little beyond the middle to the acute apex. Subgenital plate about twice as long as wide and rounded at apex. Length, about 3.8-4.5 mm.; anterior wing 3-3.4 mm.