84 BULLETIN 94. 
venter yellow, ferruginous at base, and with the hind margins of the 
segments broadly pale ferruginous. 
9; red; mesothorax and metathorax with a median black band; 
third antennal joint not greatly shorter than fourth; abdomen red, not 
black at base; second and third segments with a subquadrate bright yel¬ 
low spot on each side, third also with a pair of yellow dots mesad of the 
spots, fourth with a yellow band, not reaching lateral margins, fifth with 
a short broad band; venter without yellow. 
The is to be considered the type. It is closely allied to N. colo - 
radella, but larger, with a broader abdomen, with much more yellow. 
The 9 is very near to N. lewisi , Ckll., but has no yellow at lower cor¬ 
ners of face; and has the third submarginal cell" much broader. The 
scutellum of the 9 is low and scarcely bilobed, as in N. simplex, Rob., 
which is closely allied; but simplex has much more black on the head 
and thorax, and the fourth abdominal segment spotted instead of banded. 
Nomada ccloradensis, Cockerell. 
A pair; the 3 marked Fort Collins, Colorado, foothills, May 
19, 1900, E. S. G. Titus, collector: the $ marked Colorado 566, 
just like the original type. Taken June 24, 1892, at Montrose, by 
C. P. Gillette. At Milwaukee, Wisconsin, Dr. Graenicher has 
taken a form of N. coloradensis, which may prove to be subspeci- 
fically separable. 
The A has not been described. It is very similar to several ^s, 
from which it is readily separated as follows: 
Scape conspicuously swollen, apical plate broad.1. 
Scape ordinary; venter red not spotted with yellow; apical 
plate narrow..3. 
1. Pleura with much red; metathorax with four red spots; 
venter with large yellow markings. bethunei Ckll. 
Pleura and metathorax without red (or pleura with a 
small red mark).2. 
2. Venter spotted or banded with yellow. vicinalis Cresson. 
Venter red without yellow. vicinalis var. infrarubens Ckll. 
3. Larger; mesothorax marked with red; first abdominal 
segment with a yellow band . armaiella Ckll. 
Smaller; metathorax all black; first abdominal segment 
without a yellow band. coloradensis Ckll. 
I am greatly indebted to Mr Rehn for the information that Cress- 
on’s type of N. vicinalis has the apical plate of abdomen broad, scape 
normal, base of metathorax more granulose than rugulose, labrum with 
a very slight median denticle. 
N. yicinalis infrarubens is a new variety obtained by Prof. Cordley 
at Corvallis, Oregon, June 6,1899. It has the following noteworthy 
characters; labrum very hairy; ends of linear upward prolongation of 
lateral face-marks slightly bending from orbits; flagellum bright red, the 
last joint pointed, the first five joints black above; hair of upper part of 
thorax (especially scutellum) strongly brownish; tubercles reddish with 
a yellow spot; tegulae, scutellum, two stripes on mesothorax, and a small 
mark on lower part of pleura in front, red; first abdominal segment with 
basal half black, with two red marks; yellow bands on segments 1 to 5 
broadly interrupted by red in the middle; sixth segment with a short 
bilobed yellow band; apical plate very hairy. The antennae remind one 
of N. pascoensis , but the insect is otherwise very different. 
Nomada alpha, new species. 
One $ taken by F. C. Bishopp, marked Fort Collins, May 20, 
1903, Colorado. Taken from flowers of Capsella bursa-pas tor is. 
Length about 81 mm.; head and thorax red, with black and yellow 
markings; abdomen red and yellow. Front depressed, coarsely an 
d 
