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· 9 Nomada alpha, male, left side.JPG |
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· 9 Nomada alpha, male, right side.JPG |
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· 9 Nomada alpha, male, top back.JPG |
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· 9 Nomada alpha, male, top.JPG 2 |
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· 9 Nomada alpha, male, top.jpg |
Smithsonian Institution, Entomology Department · 9 Nomada alpha, female, face |
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Smithsonian Institution, Entomology Department · 9 Nomada alpha, female, side |
Smithsonian Institution, Entomology Department · 9 Nomada alpha, female, top |
Identification |
Extracted from Western Bees obtained by the American Museum Expeditions by Cockerell (1921).
This species differs fronl morrisoni in the red legs (with hardly any
yellow), narrower face, and other characters (see Swenk, Univ. of
Nebraska Studies, XII, p. 73), but both are very variable and I now
incline to the opinion that they represent diverse forms of a single species.
The matter will only be settled when we have larger series, including
males. Typical alpha is from Fort Collins, Colorado, 4980 ft. alt.
Further confusion is introduced by the discovery of two additional
forms of alpha, as follows.
Nomada alpha paralpha
COLORA DO: 1 9, 'VaIden, about 8400 ft. alt., among sagebrush on hillside,
June 17, 1920.
9 .-Differs thus: length fully 10 mm.; mandibles not yellow basally; labrum
yellowish, but clypeus and other face-markings pale red; red lateral face-marks continuous
with stripes along posterior orbits, and with a swelling or lobe opposite the
frontal spot; yellow behind eyes indistinct; scape red, with a blac~ stripe behind;
third antennal joint hardly longer than fourth; mesothorax with a very broad median
black stripe, and narrower lateral ones, inclined to be slightly interrupted in middle,
or one may say, black with four red stripes, the outer marginal; middle of pleura red,
and a red spot beneath the wings; scutellum entirely red; anterior femora with a large
black mark behind; first abdominal segment largely black at base; venter light red.
Nomada alpha dialpha
COLORADO: 29, 'Walden, about 8300 ft. alto on the more mesophytic riverbottom
among willows, cottonwood, Iris, etc., June 17, 1920.
9.-Length, 9.3-10.3 mm.; similar to para lpha , the venter red, or with an
obscure yellow band on fourth segment, but mesothorax red with a black triangle on anterior margin. There is more red on front, the larger specimen having a broad red
band right across. Red band behind eyes broader, without any yellow. Scape entirely
red. Mesopleura almost entirely red, contrasting with the yellow tubercles.
Anterior femora without black. First abdominal segment red, without black base or
yellow spots.
These forms have some resemblance to N. collinsia,na, Cockerell,
but are quite distinct.
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Updated: 2024-03-29 01:02:59 gmt
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