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Extracted from: Timberlake P.H., (1962). 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 V. University of California Publications in Entomology Editors, Volume 28, No. 1, pp. 1-124.
In 1928 I remarked that dasylirii is the more strongly marked and the more easily recognized of the two species described by Cockerell under the same name. At that time I knew nothing about rehni and did not recognize the second male as belonging with it; now it is clear that although dasylirii is a well-marked and easily recognized species, it is far less distinctive than rehni,
The type locality of dasylirii is Alamogordo, New Mexico, and nolinae was described from the Sabino Basin, Santa Catalina Mountains, Arizona.
Female,—Head and thorax dark green or blue-green, becoming more or less distinctly blackish on disk of mesoscutum and scutellum. Mandibles except broadly red at apex, labrum (but sometimes more or less dark at base), clypeus, and tubercles, pale yellow. Lateral face marks absent or represented by dots or a transverse mark between clypeus and anterior end of eye. Clypeus with usual dots and sometimes two submedian brownish stripes more or less evident. Collar of pronotum pale yellow, and a yellow dot sometimes present on posterior corners of disk. Abdomen fuscous, venter, and a rather narrow even band at base of tergites 2 to 5, yellow; bands on tergites 2 and 3 enclosed, but yellow extension on pregradular area of tergites 4 and 5 confluentwith the yellow on reflexed parts of sclerites; tergite 5 also narrowly yellow on lateral and apical margins. Pygidium rufotestaceous. Legs yellow; front femora except more or less broadly at apex (sometimes also except dorsal margin), mark at base of middle femora in front, mark at apex of hind femora above, outer posterior edge of middle tibiae, and hind tibiae and tarsi, brown or fuscous (sometimes front femora dark except narrowly at apex, middle femora dark also on dorsal margin except at apex, hind femora entirely dark, and front tibiae clouded behind). Antennae fuscous, but broadly lellow beneath on scape and brownish yellow on flagellum. Tegulae subhyaline, with yellow base. Wings whitish hyaline, nervures pale yellowish, margin of stigma and subcosta slightly brownish.
Head as broad as long and about as broad as thorax. Proboscis not exceeding fossa at rest, with apex of galeae falling a little short of base of stipites. Mandibles rather stout, strongly curved, reaching far margin of proboscidial fossa, and with a small inner tooth. Facial foveae somewhat more than their own width from margin of eyes and reaching from upper level of antennal sockets slightly more than halfway to level of anterior ocellus. Antennae rather long, weakly clavate; middle joints of flagellum as long as wide. Venation as in rhois; stigma somewhat more than one-third as wide as long. Pygidial plate longer than wide at base, sides converging straight to the narrowly rounded apex, disk plane. Head and thorax minutely and rather weakly tessellate and shining, middle of mesoscutum and scutellum sometimes almost polished; punctures of face minute, moderately close between foveae and antennal sockets but otherwise sparse, moderately sparse on mesoscutum. Pubescence whitish, short and thin: longer and denser on cheeks and underside of thorax; hair of mesonotum very short, erect, and slightly squamiform. Length, 4.5-5.5 mm.; anterior wing, 3.3-3.6 mm.
Male.—Vertex and upper part of occiput of head and notum of thorax, dark green; dark area on vertex more or less narrowed toward summit of eyes. Undersurface of head, cheeks almost to summit of eyes, mouthparts except red tips of mandibles, labrum, face to slightly above level of foveae, clear yellow. Prothorax except an enclosed quadrate mark on disk of notum, anterior corner of mesoscutum, entire sides and undersurface of thorax, and flanks of propodeum, yellow; generally a dark spot or streak on upper margin of the mesepisternum close to base of wings. Abdomen yellow, tergite 1 and a rather broad even band at apex of tergites 2 to 5, fuscous; band on tergite 5 preapical and sometimes very narrow, often two more or less large and orbicular yellow marks on basal half of tergite 1, and more rarely yellow band on tergite 2 enclosed. Legs yellow, sometimes entirely, but more usually hind tibiae and tarsi except, beneath, and sometimes a small spot at apex of hind femora, brown or fuscous. Antennae entirely yellow, or sometimes a pale brown dot on pedicel. Tegulae and wings as in female, but subcosta and margins of stigma generally more brownish.
Head somewhat broader than long, more or less quadrate, with very broad cheeks, broadest a little above middle of eyes, narrowed anteriorly, and sometimes with a small conical tubercle. Mandibles tapering from broad but not dilated base, very acute at apex and reaching well beyond far margin of proboscidial fossa. Facial foveae minute and punctiform. Antennae slightly clavate; joints of flagellum broader than long. Flanks of pronotum moderately impressed. Head and thorax weakly tessellate and shining, disk of mesoscutum and scutellum almost polished, puncturation obsolete. Pubescence whitish, similar to that of female, but sparser: face nude; hair of cheeks very thin, fine, and appressed; on mesonotum somewhat coarser, sparse, and erect; on undersurface of head and thorax and on ridges of propodeum moderately long and abundant. Apical lobe of tergite 7 about as long as wide and truncate at apex. Subgenital plate about as long as wide and subtruncate at apex, similar to that of rhois, but less rounded apically and with a more definite but sparse apical fringe. Genitalia much as in rhois, but parameral lobes more strap-shaped, with inner margin at apex not ridged or carinate and nearly uniform in width as seen from side, and sagittae more rounded at apex in dorsal view. Length: 3-4.5 mm.; anterior wing, 2.5-2.9 mm.
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