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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 Caifornia Press Berkeley and Los Angeles 1958, Volume 14, No. 5, pp. 303-410, plates 4-15.
Although remarkably similar to verbesinae, the female of incana has the face marks white and the hair of mesonotum white and distinctly longer and finer. These differences although slight are beyond the normal limits of variation and the geographical range of incana seems to preclude it from being a subspecies of verbesinae.
Female.—Head and thorax dark blue-green. Base of mandibles, clypeus, and transverse lateral marks white. Extreme anterior edge of clypeus testaceous brown and the upper half of disk with two large dark marks, which are tinged in large part with blue-green and separated by a white line that reaches the summit of disk. Lateral marks sometimes widened on orbits to become subtriangular, but not reaching above level of clypeus. Band on hind margin of disk of pronotum, almost interrupted medially, and the upper margin of tubercles white. Abdomen black, the apical depression of tergites more shining, and the pygidium testaceous brown. Two females out of six have traces of a band on tergites 2 to 4, and one has a distinct pale yellowish band on tergites 2 to 4, rather narrowly interrupted medially, with that on tergite 2 reaching lateral margins, that on tergite 3 with a small preapical cutoff spot at each end, and that on tergite 4 broad and much abbreviated, its two marks about as long as wide. Tergite 1 with a small light spot on lateral margins at summit of basal declivity. Legs black, the front and middle knees whitish, the anterior side of front tibiae pale yellow. Antennae fuscous above, the flagellum yellowish brown beneath, the scape, pedicel, and first joint of flagellum white beneath. Tegulae testaceous hyaline, the base white. Wings milky hyaline, the nervures and stigma pallid.
Head a little broader than long. Clypeus moderately produced with the lateral extensions partly visible in frontal view. Mandibles dilated on inner margin, the incurved tips shorter than in most Codkerellia. Proboscis short, not surpassing the pubescidial fossa; galeae shorter than stipites or the labial palpi. Frons and vertex granular tessellate and dull, the very minute punctures of frons indistinct. Mesonotum shining, the fine punctures about two to three puncture widths apart. Abdomen minutely lineolate and moderately shining. Pubescence white, rather dense, the hair of mesonotum rather short and somewhat mosslike, but longer and finer than in verbesinae. Scopa of hind legs white, long, and full as usual in CockereUia. Length, about 7 mm.; anterior wing, 4.6 mm.
Male.—Hardly distinguishable from male of verbesinae except in having the hair of mesonotum slightly longer.
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