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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.
Because of the suffused banding of the abdomen, the rather short facial foveae, and the distinct, although rather delicate tessellation of the mesonotum, impunctifrons may not be a true member of the zonalis group, but without the male a more certain or better assignment cannot be made at this time.
Female.—Head and thorax dark bluish green, the mesonotum somewhat more yellowish green. Mandibles except reddish tips, labrum, clypeus, lateral marks, and two small supraclypeal spots creamy white; labrum slightly stained with testaceous; lateral marks much higher than wide, very acute above and intruding between foveae and margin of eyes. Pronotum dark, with the collar, narrow mark on each side of hind margin of disk, and the tubercles white. Abdomen dull yellowish, suffused with testaceous, and with a mark on each side of basal declivity of tergite 1 and a band at junction of tergites 1-2 to 5-6 brownish and less sharply defined than usual; basal part of the band on tergites 2 to 6 widened at outer ends (triangularly so along the lateral foveae on tergite 2) and with a more or less triangular median lobe; apical part of the band on tergites 2 to 4 not reaching lateral margins, and that on 4 nearly reduced to an oval mark on each side. Legs whitish, the posterior side of front and middle femora, hind femora except at apex, hind tibia except broadly at base, and small joints of hind tarsi fuscous. Antennae brown, the scape except mark above at apex and underside of pedicel whitish, and the underside of flagellum whitish tinged with brown. Tegulae hyaline, with basal margin white. Wings whitish hyaline, the nervures pale yellowish, subcosta and margins of stigma pale ferruginous. Head slightly broader than long, with disk of clypeus much broader than high and broadly rounded above. Oblique lower margin of subantennal plates about equal to the outer margin and nearly twice as long as the inner margin. Mandibles moderately stout and with the inner margin abruptly narrowed before the apex without forming a distinct inner tooth. Marginal cell of wing with parts beneath and beyond stigma about equal. Pygidial plate as long as wide at base, with the sides converging nearly straight to apex, which bears a distinct small notch. Frons smootfhly tessellate, moderately dullish, and nearly impunetate, except for a few fine indistinct punctures near the ocelli. Mesonotum delicately tessellate and shining, with remotely scattered fine punctures. Pubescence white, short, thin and erect on mesonotum, but with a prescutellar band of dense appressed hair; frons nearly nude, but the cheeks with usual amount of hair. Length, about 4.5 mm.; anterior wing, 2.9 mm.
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