Extracted from P. H. Timberlake. A REvisonal Study of the Bees of the Genus Perdita F. Smith, with Special Reference to the Fauna of the Pacific Coast ( Hymenoptera, Apoidea Part V). University of California Press Berkeley and Los Anggeles 1962|
This species flies with daleae in Inyo County, California. Its flower-visiting habits are not known, except that one female was taken on Eriogonum and one male on Stanley a, but the pollen borne by some of the females appears to be identical with that on daleae females collected at the same time. The females may be distinguished from daleae by the four broad yellow bands on the abdomen and by the longer and narrower pterostigma. The wings are little if any larger than those of closely allied species, but are certainly much more ample than in many other species of Perdita.
Female.—Head and thorax dark blue green; labrum, usually most of face below level of antennae, mesoscutum except anterior border, scutellum, and metanotum, black. Face and thorax entirely dark. Abdomen blackish, or tinged with brown; a broad pale-yellow band on tergites 2 to 4 or 5, sometimes reaching lateral margins on tergite 4, and more or less distinctly notched medially behind, especially on more basal segments. Legs dark, tinged with brown, front knees and anterior side of front tibiae pale yellow, front tarsi pale brown. Antennae dark, flagellum brown beneath. Mandibles yellowish white at base, pale testaceous beyond middle, red at apex and on inner margin. Proboscis brown. Tegulae subhyaline, base testaceous or yellowish. Wings milky hyaline, whiter than in daleae; nervures pallid; subcosta pale brownish.
Head about as broad as long, with clypeus large and strongly protruding. Facial foveae generally a little bowed inward, sometimes widening on lower half, as wide or wider than interval between them and eyes, and reaching from level of middle of antennal sockets nearly three-quarters of distance to level of anterior ocellus. Mandibles stout, bluntly rounded at apex; inner margin abruptly narrowed near apex, thus inner tooth not perfectly formed. Proboscis moderately long, galeae nearly reaching base of stipites when folded in repose. Pterostigma generally over four times as long as broad, and a little more than half as wide as first sub-marginal cell; parts of marginal cell beneath and beyond it equal. Pygidial plate plane, with moderately narrow truncate apex. Head and thorax minutely tessellate; tessellation on disk of mesoscutum and on scutellum generally faint; frons and vertex rather dull. Puncturation of face and mesonotum much fainter than in daleae, but not sparser. Pubescence white, thin, short, erect, and about same density as in daleae. Length: 4.5-5 mm.; anterior wing, 3.8-4 mm
Male.—Dark blue green; disk of mesoscutum and scutellum black. Mandibles except red tips,labrum, face to level of antennae, anterior end of cheeks and gular region, and tubercles, yellow. Yellow of face reaching on orbits nearly to foveae, but more or less narrowly, and subantennal plates sometimes varying to entirely black. Abdomen orange yellow, but tergite 1 and a rather broad subapical band on tergites 2 to 5 fuscous, with the yellow on tergite 2 enclosed. Legs yellow; middle and hind coxae and posterior side of femora fuscous; sometimes a slight cloud on posterior side of tibiae, or hind femora and tibiae mostly clouded except on underside. Antennae yellow, pedicel and flagellum fuscous above. Tegulae and wings as in female, except margins of stigma as well as subcosta brownish.
Head as broad as long, quadrate in macrocephalous specimens; cheeks very broad and produced anteriorly into a conical process, sometimes very large and blunt. Occipital concavity rather deep but broad, equal in width to space between summit of eyes. Pterostigma generally some¬what longer and narrower than in female, sometimes fully five times as long as wide and not more than half as wide as first submarginal cell; part of marginal cell beneath stigma longer than part beyond. Sculpture and pubescence much as in female; disk of mesoscutum and scu-tellum polished. Tergite 7 gradually narrowed to obtuse point, with sides converging at an angle of about 75 degrees. Subgenital plate triangular, but considerably more rounded at apex than in daleae, and about twice as long as wide at base. Dorsal lobes of caulis moderately wide and obtuse, volsellae well exposed in dorsal view; parameral lobes rather wide toward apex as seen from above and with sharply carinate dorsal edge, but narrowed apically as seen from side; sagittae rather thickly fusiform, with the acute tips spreading apart. Length: 3.5-4 mm.; anterior wing, 3.3-3.4 mm.