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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.
Like N. oregonica, but the third antennal joint is very
much shorter than the fourth and the first abdominal segment
above has black only at the sides of basal half, never in the
middle. The anterior and middle femora and tibiae are red,
entirely without markings, but the hind femora have a black
stripe behind. The ventral surface of the abdomen is red,
wholly without transverse blackish stains. Mandibles simple.
Hah. Corvallis, Oregon : 6 $ , May to June 7. Received from Mr. Viereck.
Nomada erythrae also appears in this excerpt as the now synonymized Nomada astori.
FEMALE . —Length about 7.5 millim.
Red, with black markings ; mandibles simple ; abdomen
without black bands or yellow spots; yellow at lower corners
of face ; third antennal joint half length of fourth ; sides of abdomen inclined to be black- spotted. Antennae entirely ferruginous. Superficially similar to N. oregonica, but besides
the characters just given differs as follows :•—Yellow streak on lower anterior orbits longer ; sides of thorax with much
less black ; mesothorax with only one black band ; abdomen
with only the sides of first segment showing black (this as in ultima) ; dorsal surface of abdomen bright, but not shining
coppery red, except in certain lights, when it has a silvery or even purplish lustre (in oregonica it is shining and ordi- nary). The head is transversely oval, as in N. oregonica.
The abdomen in N. ultima has the same peculiar appear- ance as that of N. Astori ; it is possible that the latter is a
variety of the former, but in my material iV. ultima is easily
distinguished by the three black bands on mesothorax and
the yellow spots of the abdomen.
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