Reprinted from: Cresson, E. T. 1863. On the North American species of the genus Nomada. Proc. Entomol. Soc. Phil. 2:288-289
Male. Head black, densely and finely punctured, thickly clothed
with whitish hairs ; the clypeus, labrum, mandibles and the orbits of
the eyes on each side of the clypeus. yellow. Antennae as long as the
head and thorax; black above, flagellum beneath yellowish-ferruginous,
scape in front yellow. Thorax black, densely and finely punctured,
thickly clothed with rather long whitish hairs ; tubercles yellow, deeply
notched anteriorly with black; scutellum rather prominent and slightly
subbilobate; tegular honey-yellow. Wings hyaline, slightly iridescent,
apical margins clouded, nervures ferruginous. Legs : coxae except
tips, trochanters and the anterior and intermediate femora beneath at
base, and the whole of the posterior tibiae except tips, black, rest of
femora ferruginous, tipped with yellowish ; tibiae and tarsi yellow varied
with ferruginous. Abdomen minutely punctu.red, shining, ferruginous
; basal half of the first segment above black, and the posterior
margins of the segments with a dark stain; on each side of the middle
of the first segment an oblong yellow spot having its margins waved,
especially in front, on the posterior margin of each spot, a small distinct
fuscous dot ; at the base of each of the five following segments a
transverse yellow band, more or less attenuated within and slightly interrupted
in the middle with ferruginous, that on the second segment
broad and slightly indented with blackish on the extreme sides
riorly, the bands on the four following segments narrow and more or
less squarely indented on each side posteriorly, the band on the sixth
segment scarcely interrupted, apical segment ferruginous, bitid at tip ;
beneath ferruginous, base of the first segment black, posterior margins
of the segments with a darker stain; at the base of the second, third
and fourth segments a narrow, transverse, yellowish line attenuated in
the middle, a spot on the fifth and another on the apical segment,
yellow. Length 4 lines.
Hah. Pike's Peak, one % (Coll. Ent. Soc. Philad.); Rock Island.
111., one % (Coll. Benj. D. Walsh, Esq.).
This species resembles the % of vincta Say, but diifers by having
the face densely pilose, and by the clypeus and sides of the face having
less yellow, and in other respects. I have before me an obscure
specimen, doubtless of the same species, from Maryland (Coll. Mr.
Norton), which differs from the Pike's Peak specimen in the colors
being less bright,—in the scutellum having two ferruginous spots,—in
the spots on the first segment of the abdomen above being rather deeply
and obtusely indented anteriorly, and the fuscous dot on the posterior
margin of each spot being obsolete,—in the transverse yellow bands of
the following segments being more widely interrupted on the disk and
having their outline much less distinct, those on the fourth and fifth
segments being somewhat deeply indented on the disk anteriorly, and
that on the sixth segment obsolete, and in the yellowish markings of
the abdomen beneath being either very indistinct or else entirely obsolete.
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