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Extracted from Timberlakes PART IV revision of Perdita (1960)
This bee is similar to affinis, but the characters given in the receding key should distingnish the two species in most if not all cases. specimen from Meeker, Colo-rado, placed under affinis by Cockerell (1922) undoubtedly belongs here. 'I'he form fontis described by Cockerell from Glenwood Springs (1922, p. 9) is unknown to me and the status is uncertain. Itmay be a distinct species that would fall near separata or dalyi in my table.
li'emale.-Head and thorax dark bluish green. Base of mandibles, clypeus, small lateral marks creamy white, the lateral marks emargtnate on inner margin and reaching narrowly to level of antennae, and disk of clypeue with two dark stripes or two dark spots near the summit. Apical half, or more, of mandibles rufoteataceous, becoming redder at apex. Labrum teataceoua, or more or less brownish. Bupraclypeal area black, sometimes with one or two white dots, and rarely with a large but divided mark. Prouotum dark except white tubercles and a small mark on posterior corners of disk. Abdomen blackish, with an interrupted white band on tergites 1 to 4, the interruptions covering one-third or more of the width of the segments on tergites 2 and 3, although less than one-third with broader marks in most specimens from Nebraska; the marks on tergite 4 not reaching the lateral margins and sometimes evanescent or lacking. Legs fuecoua, the extreme apex of femora, anterior side of front tibiae, and streak on middle tibiae pale yellow, the tarsi pale brownish. Antennae brown or fuscous above, the scape pale yellow and the flagellum brownish yellow beneath. Tegulae teetaeeoua hyaline, becoming whitish at base. Wings clear or slightly whitish hyaline, the nervurea testaceoue, the subcosta and margins of stigma pale brown.
Head as broad as long, the cheeks nearly as broad as eyes. Proboscis slightly exceeding the fossa in repose. Mandibles tapering, acute, and not quite reaching the far margin of the fossa. Facial foveae generally not much wider than space between them and eyes and reaching from level of middle of antennal sockets nearly two-thirds of distance to level of anterior ocellus. Venation normal, the part of marginal cell beyond the stigma usually longer than the part beneath. Pygidial plate about as broad as long, with the sides more or less arcuate and eou-verging to the rounded apex which has a small but distinct notch. Frons and vertex almost granular tessellate, dull, and impuuctate, the meeouotum strongly tessellate but somewhat more shining than the frons and with minute, moderately close punctures i face below antennae with moderately close, fine punctures. Pubescence whitish, rather abundant, erect and fine, with that on frons and mesonotum moderately short. Length, 4.5-5 mm.j anterior wing, 3-3.1 mm.
Ma~c.-Head and thorax dark bluish green. Anterior half of gular region, posterior orbits rather broadly nearly to middle of eyes, mandibles except red tips, labrum, and face below level of antennae bright yellow; the yellow going above antennae for a short distance in median line and more broadly at sides, where it is more or less obliquely truncate from upper margin of antennal sockets to margin of eyes at lower end of foveae, or frequently more or less squarely truncate, with a slender orbital extension, and sometimes the antennal sockets are almost enclosed by yellow. Marks on pronotum and tubercles yellow. Abdomen brownish, or fuscoue, with nn interrupted yellow band on tcrgites 1 to 3; median interruption of bands generally covering about one-eighth to one-tenth of the width of the segments, with the marks on tergites 2 and 3 more or less oblique and enlarged at outer ends, those on tergite 3 sometimes abbreviated or with a cutoff lateral spot; sometimes traces of yellow, or a more or less de-veloped band present also all tergite 4. Legs brown or fuecoue, with front coxae and trccbanters except behind, the front femora broadly in front and at apex, front tibiae except behind, middle and hind coxae at apex, with their troebunters in part and apex of femora, the anterior side of middle tibiae and base of hind tibiae yellow; the front and middle tarsi pale brownish. Antennae yellow, with spot at apex of ecape above, and upper side of pedicel and flagellum brown. Tegulae and wings as in female, except base of tegulae more yellowish and nervures of wings more embrowned.
Head as broad as long, the cheeks as broad as the eyes. Mandibles tapering and reaching far margin of proboecldial fossa. Facial foveae ova], about tbrice as long as wide. Apical lobe of tergite 7 a little longer than wide, the apex narrow and rounded. Sculpture and pubescence much as in the female, the frons opaque. Subgenital plate as long as wide, the sides converg-ing almost straight to a slightly rounded apex, the disk with fine short setae. Caulia of aedengus oval, the dorsal lobes ending obliquely and continuous with dorsal margin of the base of parameral lobesj the latter lobes slightly clavate at apex as seen from above and moderately wide at base in lateral view; fused body of saglttae strongly angulate at middle and acuminate to apex in dorsal view and rather thickly fusiform as seen from side. Length, about 3.5-4.5 mm.: anterior wing, 2.7-3.2 mm.
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