Reprinted from: Cockerell,T.A. 1910. Some bees of the genus Nomada from Washington state. Psyche. 17:94
Length about 5 mm.; looks at first sight like a small example of hr,
nalonella, but differs as follows: Flagellum proportionately shorter;
lower margin of clypeus broadly yellow at sides; light parts of legs
paler and suffused with yellowish; hind legs black except the knees,
and apices of the other oints; t. m. a little basad of b. n.; scutellum
less prominent; ground-color of abdomen light yellowish-red; first
segment with more than basal half black, the edge of the black rather
concave in the middle (projecting to form an angle in nalonella);
fourth and following segments dark with a subapical yellow band;
sides of segments 9 to with a broad oblique light yellow band, on 9
and 3 with a dark patch in front; ground color of venter dark, and
light bands much broader. In both species the apical plate is strongly
notched.
Hab.--Wawawai, Washington State, May 15, 1909 (W. M.
Mann).
The following table separates the four related species. The
venation of N. melliventris was kindly noted for me by Mr. Viereck,
from Cresson’s type.
Basal nervure going far basad of transversomedial 1.
Basal nervure falling a little short of transversomedial
1. Tegule dark reddish; labrum black, except margins; scutellum prominent
malonella
Tegulm yellowish; labrum yellow; scutellum not prominent, melliventris
9. Scape with a large red basal patch in front; ground color of abdomen
bright coppery-red elegantula
Scape wholly black; ground color of abdomen pale yellowish-red
malonina
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