Extracted from: P.H. TImberlake. 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 California Press Berkeley and Los Angeles 1958|
Female.—Head somewhat broader than long. Mandibles rather massive, strongly curved, with the apex acute and the inner margin subdilated and forming a distinct inner tooth. Facial foveae broad and well impressed, much less than their own width from margin of eyes and reaching from level of middle of antennal sockets about two thirds of distance to level of anterior ocellus. Stigma of wings moderately large and broad, and marginal cell with part beyond stigma about one-fourth longer than the part beneath. Pygidial plate usually about as long as the basal width, with sides converging nearly straight to the moderately narrow apex, which usually has the median notch weak or evanescent. Frons strongly tessellate, rather dull, and with distinct, fine close punctures which become sparser mesad and near the ocelli. Mesonotum polished, with moderately sparse fine punctures. Wings slightly dusky hyaline, the nervures pale brownish testaceous, the margins of stigma and subcosta more fuscous.
Male.—Head considerably broader than long. Mandibles simple, acute at apex, and reaching far margin of proboscidial fossa. Facial foveae faint and about two to three times longer than wide. Frons minutely tessellate, opaque, and obscurely punctured. Mesonotum polished and with moderately sparse punctures. Wings as in female, but with darker nervures, Subgenital plate a little longer than wide, the sides at first converging slightly, then running straight to the slightly rounded apex. Caulis of aedeagus nearly as broad as long, with the parameral lobes about as broad as long and the dorsal part mainly covering the inferior part in dorsal view; fused body of sagittae not much more than twice as long as wide and angulately narrowed, close to the subacute apex.
Perdita zonali zonali subspecies of Perdita zonalis
The female of typical zonalis has the face marks restricted to clypeus, lateral marks, and a supraclypeal mark; the pronotum yellow with a dark band, narrow on the disk, and much expanded on the flanks; abdomen yellow, with four even blackish bands and a dark spot on each side of tergite 1; legs yellow, the hind tibiae and tarsi fuscous, the front femora usually with a dark blotch behind, and a dark line often present on front and middle tibiae.
Male.—Head and thorax dark bluish green, the mesonotum more yellowish green. Mandibles except red tips, labrum, face mainly below level of antennae, anterior end of cheeks, and short postorbital line bright yellow. Lateral marks of face ending more or less acutely just above level of antennae, with the green of frons intruding slightly between them and upper end of subantennal plates. Subantennal plates yellow, with the suture and sometimes a narrow space at lower end black. Pronotum dark green, with narrow anterior margin more or less interrupted on the flanks, spot on each side of hind margin of disk, and the tubercles yellow. Abdomen yellow, with first tergite usually entirely, band at base of tergite 2, and bands at junction of tergites 2-3 to 4-5 (or 5-6) fuscous or blackish; tergite 1 sometimes with a narrow and inter rupted yellow band; yellow bands on tergites 2 and 3 subequal to the dark bands. Legs yellow, with a streak or blotch on front femora behind, streak on posterior side of front and middle tibiae, hind tibiae and basitarsi except beneath, usually small joints of hind tarsi and sometimes a small spot at apex of hind femora fuscous. Spot on apex of scape, pedicel, and flagellum above brownish fuscous, the antennae otherwise yellow, becoming more brownish on underside of flagellum. Tegulae yellow at base and hyaline on outer margin. Length, 4.75-5.5 mm.; anterior wing, 3.1-3.9 mm.
Perdita zonali pallescens subspecies of Perdita zonalis
Female.—Like typical sonalis but markings paler yellow or almost creamy white. Face some times with small subantennal yellow marks. Pronotum pale with large green mark on the flanks and with at most only a trace of dark color on the disk. Dark markings of legs restricted to hind tibiae and tarsi and a faint or more or less evanescent streak on middle tibiae. Spot on each side of tergite 1 tending to be very small and pale brown. Wings a little less dusky hyaline, the nervures yellowish testaceous, with subcosta and margins of stigma hardly darker. Length, about 5.5-6 mm.; anterior wing, 3.5-3.8 mm.
Male.—Similar to sonalis male, but abdomen sometimes paler yellow, generally with only three dark bands beyond the base of tergite 2; tergite 1 usually with a narrow and interrupted yellow band; dark markings of legs more restricted, with the hind tarsi light, or the small joints very pale brown; wings usually less dusky, with paler nervures. Length, about 5-5.5 mm.; anterior wing, 3.3 mm.
Perdita zonali aequalis subspecies of Perdita zonalis
Female.—Differs from typical sonalis in having a broad dark band across the basal declivity of tergite 1, with lateral margins of extreme base remaining yellow; preapical yellow band of tergite 1 rather narrow and entire, but uneven or moderately widened mesad; wings a little less dusky (in comparison with material of sonalis from southern California) with nervures yellowish, the stigma nearly uniformly pale ferruginous or centrally pallid, and the subcosta brownish.
Male. — Similar to typical sonalis, but subantennal plates usually more or less black at lower end, or sometimes nearly all black; disk of pronotum, except collar, usually dark; legs generally more strongly marked with brown or fuscous, dark bands of abdomen somewhat broader and blacker, the yellow band on tergite 2 often constricted sublaterally or with a cutoff spot at outer ends; wings about as in sonalis, the nervures darker than in the female. Length, 4.5-5 mm.; anterior wing, 3.2-3.5 mm.
Perdita zonalis monticola subspecies of Perdita zonals
Female.—Much like aequalis,but wings comparatively strongly dusky, the nervures brownish testaceous, the subcosta brown, and the stigma nearly uniformly amber color and usually not much darker on the margins. Pronotum yellow, with a large dark mark on the flanks, or the green forming a band across the disk, with the yellow on posterior border sometimes interrupted in the middle and also on each side between tubercle and disk. Basal declivity of tergite 1 yellow, with a fuscous crossband often interrupted medially, or sometimes extending toward the base. Length, 5.5-6.5 mm.; anterior wing, 3.9-4.2 mm.
Male.—Lower end of subantennal plates commonly more or less black, but face sometimes virtually all yellow below level of antennas. Pronotum dark, the collar, small spot at posterior corners of disk, and tubercles yellow. Abdomen usually with tergite 1 entirely dark except on the reflexed lateral margins, and with a more or less broad and complete dark band at junction of tergites 6-7, so that the ground color is usually dark above with five more or less even yellow bands. Legs yellow, with a broad blotch behind on front and middle femora and tibiae, spot at apex of hind femora, and the hind tibiae and tarsi brownish fuscous. Wings distinctly dusky hyaline, the nervures and margins of stigma brownish fuscous, the subcosta fuscous. Length, 4.8-5.5 mm.; anterior wing, 3.5-3.8 mm.
Perdita zonalis bernardina subspecies of Perdita zonalis
The female of bernardina differs from the other races of zonalis in having the supraclypeal area black, the femora more or less or sometimes almost completely dark, and the clypeus often marked with black. An extreme variant has the face dark except for small transverse lateral marks. This race occurs in the Bear Valley and Santa Ana Canyon region of the San Bernardino Mountains. Material col lected at Cactus Plat on the eastern desert slope of the San Bernardino Mountains shows intergradation with the race pallescens.
Female.—Dark green, with clypeus and lateral marks pale yellow or creamy white. Clypeus often with two abbreviated dark stripes, whieh are sometimes enlarged to cover most of the disk, either with or without a pale median streak. Supraclypeal area and subantennal plates typically black, but in perhaps not more than 20 per cent of the population a supraclypeal mark is more or less developed, either as two small or evanescent spots, or more rarely as a fully developed mark, notched medially above. Abdomen with creamy white or pale yellow and blackish bands; light band on tergite 1 narrow and sometimes broken into four small transverse spots, or more rarely with a spot only on lateral margins. In extreme variants the abdomen is dark, with the light spots on tergite 1 very small or absent, the light bands on tergites 2 to 5 narrower than usual, slightly interrupted medially, and those on tergites 2 and 3 inclined to be arcuate. Femora of legs fuscous, with apex of front and middle pair and mark on anterior side of hind pair yellow, or sometimes either almost entirely dark or the dark color restricted to posterior side of front femora, posterior side of front and middle tibiae, and to the hind tibiae and tarsi. Length, 4.8-6.5 mm:; anterior wing, 3.7-4.3 mm.
Male.—Lower part of subantennal plates usually more or less dark. Pronotum dark, except tubercles and sometimes a small spot on each side of hind margin of disk. Legs tending to have a dark mark developed on all the femora. Basal orifice of the caulis of aedeagus smaller and narrower than usual, with the margin enclosingthe orifice unusually broad. Lenth, 4-5 mm.; anterior wing, 3.5-3.8 mm.