Extracted from Western Bees obtained by the American Museum Expeditions by Cockerell (1921).
WYOMING: 1!;1, Stewart Ranger Station, in the Jackson Hole country at about
43° 42' N., 110° 45' 'V., about 6700 ft. alt .• lodgepole pine, Engelmann spruce, etc.,
July 18, 1920.
!;1.-Length about 12 mm.; bright sulphur yellow, marked with red and black;
head broad, orbits somewhat converging below; eyes pale grayish, suffused with
reddish, but on the upper third greenish; hair of head and thorax scanty, dorsum of
thorax almost entirely nude; mandibles simple, yellow, black at end; lateral facemarks
broad, extending over eyes to a broad stripe down posterior orbits, but interrupted
by a large red patch on upper part of front; black marginal spots on clypeus,
connected by a line with base of antennre; region above and between antennre
blackened, but a transverse red band across front; vertex and posterior part of head
black, a little red on occiput; atennre stout; scape thick, yellow, partly red behind;
flagellum enti~ely bright ferruginous; third ~ntennal joint r.bout as long as fifth, but
conspicuously shorter than fourth; mesothorax coarsely rugose and dull, red, with yellow
stripes over tegulre and behind, and a median black band, narrow and faint in
middle, triangularly expanded posteriorly, and less so in front; prothorax black, with
the swollen upper margin and tubercles yellow; a small black area below wings; mesopleura
yellow, with a transverse reddish stain on upper part, and a large red patch
below; a broad black area behind mesopleura, bordered with red at s:des of metathorax;
metathorax with a broad median black band, the sides of the basal area having
large yellow patches; scutellum and postscutellum yellow, the former strongly
bigibbous; tegulre pale yellowish, semitransparent; wings reddish, stigma and
nervures ferruginous; basal nervure going a considerable distance basad of transverse
median; third submarginal cell broad below; legs yellow; anterior trochanters
and marks at base of femora red; middle coxre mainly black, their trochanters red
with a yellow spot, and their femora largely red at base; hind coxre marked with red
and black, their trochanters red, their femora mainly black on inner side, and with a
red basal patch above, their tibiro red on inner side except at base, their basitarsi
with dense short light red hair on inner face; abdomen bright yellow; basal half of
first segment red, with a median black mark; four rather narrow dark bands, the
first two reddish, on apices of segments and adjoining ba~es; venter yellow, with two
narrow dark bands, failing laterally.
A member of the subgenus Xanthidiurn, running in my tables to
N. rnorrisoni flagellaris Cockerell, but certainly distinct. In Swenk's
table of Nebraska species it runs to the much smaller N. citrina jltworna,
rginata Swenk, and in his further table of t·he same group (Univ. of
Nebraska Studies, XII, p. 68) it runs nearest to N. rufula (Cockerell),which was described as a variety of citrina. I t differs from rufula in
the venation and other characters and is, I think, certainly distinct.
N. rufula is from Idaho.
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