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Extracted from: Timberlake P. H., (1960). 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 IV. University of California Publications in Entomology Editors Volume 17, No. 1, pp. 1-156, plates 1-17.
This is a yellow species of unusually large size for the octomaculata group. In Cockerell's table (1896) it runs near P. luteola, but is about twice as large, with small black markings and a shining mesonotum.
Male.—Bright yellow including legs and antennae, and with small black or blackish markings as follows: the facial foveae, a dot on margin of each ocellus, short streak on lateral impressed lines of mesoscutum, a dot at posterior end of the median impressed line, a transverse streak in the deep impression behind each axillae, a short longitudinal streak at the outer ends of the metanotum, short transverse streak on each side of base of propodeum, a short arrow-shaped mark, pointing distad, on middle of apical half of propodeum, a small spot on each side of the summit of truncation of propodeum, median streak at base of tergite 1, a spot on each side of summit of the basal declivity, a pair of transverse marks placed closer together on apical margin of same segment, a pair of similarly situated marks on apex of tergites 2 and 3, the lateral foveae of tergite 2, and the extreme basal margin of tergites 2 and 3. Antennae somewhat more orange yellow than body, with a small black spot on pedicel and a more brownish spot on the next four joints, those on the second and third of these joints larger and extending obliquely toward the inner side. Mandibles and claws of legs rufous at apex. Tegulae yellow, with the outer margin subhyaline. Wings clear hyaline, the nervures and margins of stigma brownish testaceous, the subcosta slightly darker.
Head rotund, as broad as long, the face depressed, the cheeks unarmed and considerably less broad than the eyes. Mandibles rather short, tapering, and simple. Proboscis ordinary, the galeae shorter than the stipites. Facial foveae small, oval, about twice as long as wide. Claws of legs small, the inner tooth about one-half as long as the outer. Face below antennae minutely tessellate, rather shiny, and sparsely punctate, but frons and vertex opaque, impunctate, with the sculpture excessively minute. Thorax delicately tessellate and shining, the mesonotum almost polished, with minute sparse punctures. Abdomen minutely lineolate and a little duller than thorax, the apical tergitse sparsely punctate. Pubescence white and moderately dense on cheeks, the pleura and sternum of thorax, abundant but short and appressed on sides of face below antennae, sparse and fine on the f rons and extremely fine, short, and sparse on the mesonotum. Subgenital plate anomalous for this group, about twice as long as wide, with apical fourth dividing into divergent lobes. Caulis of aedeagus broad across the middle, then narrowed to base of parameral lobes, which are moderately long and rather broad as seen from above; sagittae of moderate length and broadly fusiform, with the apex acute in both dorsal and lateral views and provided with a large eversible sac. Length, about 8 mm.; anterior wing, 4.5 mm.
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