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Extracted from: Cockerell (1909). New American Bees. The Entomologist vol. VIII
Female : Length, 7 to 8 mm.; ferruginous red; head, thorax, and
legs marked (not heavily) with black, but with no yellow; abdomen
shining light ferruginous, with no black except three spots (one basal
and two lateral) on first segment, and even these sometimes hardly
developed; seoond abdominal segment with a variable but always
large cream-coloured patch on each side; third segment with much
smaller spots, sometimes reduced to dots; fourth with two transverse
subdorsal spots, sometimes absent; fifth with a pair of large spots,
usually confluent; apex with a rather narrow band of silvery tomentum.
Antenme entirely clear ferruginous, third joint a little longer
than fourth, flagellum rather thick; mandibles simple; first joint of
labial palpi much longer than the other three united; middle of face,
connecting with a large area enclosing ocelli, and hind part of cheeks,
black; scutellum strongly bilobed; mesothorax very densely punctured,
with a medi1.1n black band, broadening anteriorly; metathorax
with a black band, and its sides with white hair; teguhe bright
ferruginous; wings dusky hyaline,- clear subapically and strongly
dusky at apex; stigma ferruginous, nervures fuscous; b. n. meeting
t. m.; second s. m. large, receiving the r. n. far beyond its middle;
third s. m. narrowed greatly above; tibire and tarsi without black,
but the femora marked with black, especially the hind ones; venter
of abdomen red without markings. In my table of Rocky :11:ountain
Nomada (Bulletin 94,-Colo. Exp. Sta.) this nms nearest to N. lnteopieta,
but differs in the proportions of the antennal joints, and the
pale yellow abdominal markings. The same characters, and the
venation (b. n. meeting t. m.) readily separate it from N. eymbalaTi03
and N. mera, which run to the same point in the table. In many
respects N. vexator resembles N. aeecpta, but the abdomen is much
darker and more copiously ornamented with cream-colour in accepta,
while the mesothorax is three banded, and there are yellow spots at
the lower corners of the face.
Male : Length, 7 mm.; head and thorax black, without any red;
both densely punctured, and with quite abundant white hair, which
is appressed and bright silvery on face; thorax with no light markings
except a cream-coloured spot on the tubercles; clypeus with the
lower half (narrowest in the middle), lateral marks sending linear upward
extensions to level of antennre, scape in front, labrum, and
mandibles except apex, light yellow; third antennal joint about as
long as fourth on upper side, but much shorter below; scape and first
four joints of flagellum black above, remaining joints showing successively
decreasing infuscation: legs red, anterior and middle femora
black basally beneath, hind femora black with the apex red; second
s. Ill. narrower than in female, receiving r. n. in middle; abdomen
marked nearly as in female, but basal half of first segment nearly all
black, and blackish transverse stains on third and fourth; apical segments
with thin white pubescence; apical plate very narrow and pointed, entire; venter red, with black only on first segment. The
markings of the abdomen are not unlike those of N. gracilis, but the
apical plate is entirely different.
Hab. Troublesome, Colorado, alt. 7345 ft., June 9th, 1908
(S. A. Rohwer). One male and five females, the type being
one of the latter.
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