Reprinted from: Cockerell,T.A. 1903. New American hymenoptera, mostly of the genus Nomada. Ann. Mag. Nat. Hist. 64(3):205
$ .�Length 8 millim.
Form ordinary ; ferruginous, the extreme lower corners of
face, a very small spot on each side of first abdominal segment
(sometimes absent), a large spot on each side of second
and third segments (often with a minute spot adjacent on the
inner side), two spots and a band or four spots on fourth
segment, and two spots on fifth segment bright yellow; patch
enclosing ocelli, hindmost part of cheeks, spot on sides of
prothorax, stripe on mesothorax, stripe on metathorax, stripe
from wings to middle coxse, middle femora beneath at base,
and hind femora and tibise behind suffusedly, all black.
Mandibles simple ; hair of face white in the middle, golden
at sides ; antennae entirely red, third joint barely shorter
than fourth ; mesothorax dull and extremely closely punctured
; scutellum not noticeably bilobed ; tubercles and
tegulse reddish amber. Wings smoky, the pale patch distinct
stigma ferruginous ; nervures piceous ; second submarginal
cell much broader above than third. Hair on inner side of
basal joint of hind tarsi mouse-colour ; abdomen with minute
close inconspicuous punctures, its first joint without any
black, its ventral surface without markings.
Ilab. Corvallis, Oregon, May 7, June 5 ; three specimens.
Received from Mr. Viereck. Named after Meriwether
Lewis, the explorer.
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Extracted from: Cockerell T.D.A., New American Hymenoptera, mostly of the Genus Nomada pp. 35-37.
FEMALE . —Length 8 millim.
Form ordinary ; ferruginous, the extreme lower corners of
face, a very small spot on each side of first abdominal segment (sometimes absent), a large spot on each side of second
and third segments (often with a minute spot adjacent on the
inner side), two spots and a band or four spots on fourth segment, and two spots on fifth segment bright yellow; patch
enclosing ocelli, hindmost part of cheeks, spot on sides of prothorax, stripe on mesothorax, stripe on metathorax, stripe
from wings to middle coxse, middle femora beneath at base,
and hind femora and tibise behind suffusedly, all black. Mandibles simple ; hair of face white in the middle, golden
at sides ; antennae entirely red, third joint barely shorter than fourth ; mesothorax dull and extremely closely punctured ; scutellum not noticeably bilobed ; tubercles and
tegulse reddish amber. Wings smoky, the pale patch distinct
stigma ferruginous ; nervures piceous ; second submarginal
cell much broader above than third. Hair on inner side of basal joint of hind tarsi mouse-colour ; abdomen with minute
close inconspicuous punctures, its first joint without any
black, its ventral surface without markings.
Nomada lewisi also appears in this excerpt as the now synonymized Nomada oregonica,
FEMALE . —Length 7-8 millim.
Form ordinary ; dark ferruginous, a very minute mark at each lower corner of face, a spot on each side of second, third,
and fourth abdominal segments (sometimes only on the second,
or on the third and fourth and nearly obsolete on the second),
two faintly indicated discal spots on the fifth, and two or four small spots on the ventral surface near the end yellow ; pattern
of black markings as in N. Lewisi, but there are three black
stripes on the mesothorax, the outer ones occasionally failing
posteriorly, and the base of the first abdominal segment is black ; on the underside of the abdomen there are often three transverse stains, not amounting to distinct black bands;
mandibles simple ; flagellum entirely ferruginous ; third antennal joint not very much shorter than fourth ; head trans- versely oval; mesothorax very densely punctured ; tegulse
yellowish ferruginous, well punctured. Wings moderately
smoky ; stigma very dark ferruginous, nervures piceous.
Scutellum not obviously bilobate ; abdomen practically impunctate.
MALE. —Length about 6^ millim.
Head and thorax black instead of ferruginous ; antennae
long, flagellum black above; narrow anterior margin of
clypeus, lower corners of face, and mandibles except tips dull reddish yellow ; labrum the same colour, with the middle
blackish ; tubercles with a reddish spot, but no other marks
on thorax, which is quite hairy; abdomen with a black mark
on each side of second segment near base; yellow spots on
sides of second, third, and fourth segments, and subdorsally on fifth and sixth ; apex strongly emarginate; on the ventral surface basally is a large obcordate black patch. The anterior and middle femora and tibige have a very distinct black
stripe behind, on the hind legs the black is more abundant
and more suffused.
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