Extracted from Western Bees obtained by the American Museum Expeditions by Cockerell (1921).
COLORADO: 2 ~, Electra Lake (type locality), near Durango, about 8400 ft.
alt., June 29, 1919; 2 ~, Pagosa Springs, about 7400 ft. alt., in U. S. forest reservation,
San Juan valley, June 23, 1919. Both of these regions contained oaks, Pinus
scopulorum, etc. .
~ .-Length about 9 mm.; head, thorax and legs clear red, almost without
yellow; sides of face suffusedly lemon-yellow; tubercles and postscutellum inclining
toward orange; mandibles simple, black at end; eyes pale reddish; clypeus closely
and finely punctured; antenrire long, bright ferruginous, third joint considerably
shorter than fourth, but more than half as long; meso thorax finely granular, entirely
red; scutellum strongly bigibbous; lower part of pleura deeper, less yellowish, red
than the rest; a 1ittle black about bases of coxm, and hind femora variably suffusedly
blackened on inner side; tegulm yellowish red, shining but punctured; wings reddened,
stigma dull ferruginous, nervures fuscous; basal nervure going a little basad of
transverse median; abdomen light red with bright yellow bands, on first segment
broken into two spots, on second broad at sides but thin and flexuous in middle,
varying to much broader; on third, fourth and fifth broad, the last with a pair of
pellucid spots; venter with first segment red, tpe next three with broad yellow bands
the fifth with a pair of large round yellow spots, containing a small reddish spot near
margin.
A pretty little Xanthidium, perhaps related to rufula. Superficially
it looks exactly like N. vallesina Cockerell; but that has the fourth
antennal joint much shorter, lacks the yellow at sides of face, etc .
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