Reprinted from: Cresson, E.T., 1878. Descriptions of new North American Hymenoptera in the collection of the American Entomological Society. Trans. Am. Entomol. Soc.7:69.|
much like albipennis Cress., but smaller;
head and thorax blue or greenish blue, thinly clothed with pale pubescence;
a deep longitudinal groove on anterior orbite, more conspicuous than in albi
pennis; sides of face narrowed above, clypeus, two dots above, sometimes con
fluent, occasionally an irregular transverse Hue on front above antenna, labrum,
mandibles except tips, scape beneath, interrupted bend on prothorax, tubercles
and tegula white or yellow; sometimes the clypeus has two or more bleck dots;
flagellum pale testaceous, brown above; thorax smooth and shining; wings
whitish-hyaline, nervures and stigma white or yellowish, neuration as in
hyalina; legs yellow the two auterior pairs more or less bleck behind, posterior
femora above and their tibia except base, black, tarsi varied with fuscous;
abdomen oblong-ovate, flat, shining, yellow, with more or less broad black or
brown band at apex of each segment above; in well marked specimens these
bands bend obliquely downwards on base of the following segment: the first
segment being black or brown with a yellowish band on the disk; apical seg
ments fringed with pale hairs; venter yellow. Length .25 inch.
Var.?Four anterior legs entirely yellow; abdomen yellow with narrow
blackish band at apex of segments 1?4, ending laterally in a dot which is
sometimes separe ted from the band.
Hab.?Colorado, (Ridings, Morrison). Seven specimens. This
species is quite variable in its markings and specimens will doubtless
be found with the abdomen entirely yellow.
Mr. Frederick Smith, to whom specimens were sent, refers this
species to Nom ioides Schenck.
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 Caifornia Press Berkeley and Los Angeles 1958
P. zebrata is probably the most abundant, or, at least, the most easily collected species of the genus in the Rocky Mountain states. It has been recorded from numerous localities in New Mexico, Colorado, Nebraska, Montana, and Utah, and the form with yellow markings, now to be known as P. zebrata flavens, from Wyoming and Nevada. It collects pollen from species of Cleome, but has been recorded also from flowers of Solidago and Helianthus, which it visits presumably only for nectar. The type locality is Colorado, without a more definite location.
Cresson confused two distinct species in his description of zebrata, the nontypi-cal one (female of luteiceps Cockerell) having bright yellow markings, which accounts for the mention of yellow in the markings and the asserted extension of the face marks above level of antennae.
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.
Perdita zebrata flavens n. subspecies
This race differs from typical zebrata only in having the creamy-white markings
changed to a bright yellow, which modification must have been induced as an
adaptation to the yellow-flowered Cleome lutea in the Great Basin region. Cockerell
in 1922 recorded females with yellow markings from Green River and Rock
Springs, Wyoming, as well as one out of four specimens, with intermediates, from
Grand Junction, Colorado. Specimens from Granger, Wyoming, apparently have
the markings uniformly yellow, but two females from Whitney and Montpelier, Idaho, have white markings. Material from Utah exhibits variability, but specimens with white markings predominate, except probably in some localities such as Vernal and Kanab. The race flavens presumably occurs throughout most of the
Great Basin but intergrades with typical zebrata over a wide area along the
eastern border. Type material of flavens is therefore being restricted to specimens
from Nevada and Oregon