1910] Cockerell — Bees of the Genus Nomada 97 
Mr. Mann’s specimens have the abdomen dark red, and agree with 
Viereck’s description in both sexes. On this basis, the species seems 
valid; but the Kincaidian specimens, which I formerly (Proc. Acad. 
Nat. Sci. Phila., 1903, p. 601) referred to NW. bella Cresson, have the 
female paler than in typical bella, and do not seem to be perbella. 
More collecting is needed to determine whether there are really two 
species. 
(2.) N. perplexans, n. sp. Pullman (Mann). 
(3.) NN. cuneata Robertson. Pullman, May (Mann). This is not quite 
typical; from a single specimen I cannot determine whether there 
is a distinct northwestern race. 
(4.) NN. grayi eastonensis Ckll. Easton. 
(5.) WN. washingtoni Ckll. 
Nomada s. str. (Robertson.) 
Like Gnathias but with simple mandibles. 
(6.) N. flammigera Ckll. N. Yakima (Jenne); see Ann. and Mag. Nat. 
Hist., July, 1906, p. 71. 
(7.) WN. cressoni trevoriana Ckll. Olympia (Kincaid). 
(8.) NV. kineaidiana Ckll. 
(9.) NV. itamera n. sp. Pullman (Mann). 
(10.) WV. orcusella n. sp. Orcus I. (Mann). 
(11.) WV. malonella n. sp. Wawawai (Mann). 
(12.) N. malonina n. sp. Wawawai (Mann). 
(13.) NN. packardiella Ckll., var. a. Mesothorax with three black stripes; a 
large yellow patch on fifth abdominal segment. Pullman, May 14, 
1909 (Mann). 
(14.) NV. pulsatille Ckll., var. a. Silvery apical lunule on abdomen larger. 
Pullman, May 2, Spokane, May 30, and Wawawai, May 1 (Mann). 
(15.) NV. vicinalis aldrichi Ckll. Spokane, May 30 (Mann). 
Xanthidium. 
(16.) IV. citrina Cresson. 
(17.) NN. rivalis Cresson. 
(18.) WV. civilis Cresson. Males with scutellum all dark. Wawawai, April 
24 to May 15, and Pullman, May 20 (Mann). 
(19.) WV. civilis spokanensis n. subsp. Spokane (Mann), 
(20.) IV. modocorum Ckll. Spokane, May 30 (Mann). 
(21.) N. coquilletti Ckll. Wawawai, March and April (Mann). 
The characters originally given to separate N. coquilletti from N. 
modocorum are not constant; the Washington State specimens separate 
as follows: 
