2 Myron Harmon Swenk 
1S | 
I originally described this species from a typical pair and six 
paratypes from Wyoming, Colorado, Idaho, and Oregon, and 
indicated that it was probably a mountain species of extended 
distribution. The accumulation of additional material shows it 
to range from the Pacific coast states from Washington (Ya- 
kima, Pullman) to central California (Santa Clara county) east 
to the plains in Nebraska (Gordon) and Texas (Fedor), in both 
Sonoran and Transition zones. It flies in the Northwest prin- 
cipally in June and July, southwardly from late August to early 
October (August 29-October 6). Three females collected at 
Lehi, Utah, September 9, 1905, by Mr. W. A. Hooker were taken 
on Chrysothamnus nauseosus, which is the only flower record I 
have; the species, however, probably visits several Compositae 
like the closely related Colletes armatus. 
SPECIMENS EXxAMINED—California: Santa Clara county, 2; 
Colorado: 2; Idaho: Market Lake, 1; St. Anthony, 1; Nebraska: 
Gordon,’ 1; Nevada?) Reno}: 23. Oregon i *Carvallis,)2*> Texas: 
Fedor, 1; Utah: Lehi, 3; Washington: Grand Coulee, 2; Pull- 
iiaisis Yakima, ; 
Coiletes nevadensis n. sp. 
3S. Practically similar externally to males of C. fulgidus, but differing 
in the characters of the seventh ventral plate, which is glabrous on the 
striated disk from the lateral bristle tufts to two-thirds the length of the 
lobe; differing widely from that of armatus also by the roughly trapezoidal 
instead of columnar outline. (Plate 3, figures 16 and 16a.) 
2. Unknown or indistinguishable from C. fulgidus &. 
Type Locarity.—Reno, Nevada; type in. collection of the 
author. 
The type was collected September 3, 1889, by Mr. F. H. Hill- 
man. No doubt we have here a case parallel to that exhibited 
between the palaearctic species balteatus Nyl. and eous Morice, 
which agree so closely externally that Rev. Morice is unable to 
separate them except on the characters of the seventh ventral 
plate. In nevadensis the plate is so distinct from that of either ~ 
fulgidus or armatus that I am compelled, for the present at least, 
to consider it a distinct species. 
SPECIMENS EXAMINED—Nevada: Reno, I. 
94 
