Reprinted from: Cockerell,T.A. 1903. New American hymenoptera, mostly of the genus Nomada. Ann. Mag. Nat. Hist. 64(3): 206-207
$ .—Length about 1\ 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 ordinary).
The head is transversely oval, as in N. oregonica.
The abdomen in N. ultima has the same peculiar appearance
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.
Bab. Corvallis, Oregon : 1 $ , June ; var. a) May 20, ? .
Named after John Jacob Astor. Received from Mr. Viereck.
The specimen taken in May is smaller and has three bands
on mesothorax and the first segment of the abdomen black
right across at base ; the third antennal joint is even shorter
than in the type, being less than half the length of fourth.
The abdomen is quite without yellow spots. This looks like
a distinct species, but I leave it with this mention for the
present.
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