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.|
Perdita crassa n. sp.
This species is easily confused with texana, but distinguishable by the darker color and duller sculpture as set forth in the preceding key.
Female.—Head and thorax black, the abdomen blackish, with the broad apical depression of tergites rufotestaceous, and the venter more or less dark ferruginous or sometimes reddish brown. Mandibles, antennae and legs dark, the base of mandibles yellowish and sometimes with a red spot before the apex, the flagellum brown beneath and the tibial spurs pale red. Tegulae testaceous, becoming fuscous at base. Wing moderately dusky hyaline, the nervures dark ferruginous, subcosta and stigma blackish.
Head about as broad as long and subrotund. Mandibles stout, with a small inner tooth. Facial foveae well impressed, linear, and elongate, slightly widened at upper end and reaching from level of antennae to level of anterior ocellus. Face below antennae smooth and shining, the clypeus with rather coarse sparse punctures scattered over the disk. Frons and venter minutely tessellate, rather dull, and with fine close punctures. Mesonotum minutely, rather delicately tessellate and shining, the puncturation coarser than that of frons and nearly uniformly close. Abdomen dull, with a minute lineolation and very minute punctures. Pubescence whitish, about as in texana, but hair of face a little denser; apical fimbria ochreous. Length, about 8-9 mm.; anterior wing, 5-5.9 mm.
Male.—Head and thorax black, the abdomen ferruginous becoming a little infuscated on the first tergite. Mandibles yellow on basal half, then shading through rufotestaceous into piceous at apex. Antennae fuscous, the scape narrowly and the flagellum broadly brown beneath. Legs blackish, or black tinged with brown, the front knees, anterior side of front tibiae and the front tarsi brownish yellow, the apical joints of other tarsi brown. Tibial spurs, tegulae, and wings as in female.
Head enlarged, much broader than long and broader anteriorly than at vertex, the anterior margin subtruncate. Eyes strongly diverging anteriorly. Mandibles stout, tapering to the rather blunt apex, strongly curved, and reaching far margin of pubescidial fossa. Facial foveae rather faintly impressed, several times longer than wide, and widened at upper end. Abdomen depressed and much broader than thorax. Face below antennae shining, the clypeus with small close punctures. Frons and vertex minutely tessellate, dull, and with fine close punctures, becoming somewhat coarser in the middle of the vertex. Mesonotum shining, with close fine punctures, which are finer than the coarsest punctures of the frons. Abdomen more shining, less definitely punctured than in female. Pubescence about as in female, the abdomen similarly invested with a very fine, appressed, sericeous hair on the apical tergites. Subgenital plate slightly broader than in texana, with the apex retuse. Genitalia similar to the same parts of texana, but parameral lobes bluntly and evenly rounded at apex as seen from above, and broad and emarginate in lateral view; inner pair of volsellae smaller and nearly uniform in width; fused part of sagittae more elevated between the spreading lobes of caulis, with the chitinized tips slightly upcurved. Length, 6.5-8 mm.; anterior wing, 5-5.6 mm.