832 13. COLUBRID 
in three, or 3%; 19—19—17 in one, or 1%; 20—21— 
19—17 in one, or 1%; and 20—21—17—17 in one, or 
1%. The gastrosteges vary in number from 148 to 182, 
males having from 159 to 182, females from 148 to 177; 
the average in fifty-three males is 174.2, in forty-seven 
females, 169. The urosteges vary from 67 to 95, males 
having from 79 to 95, females from 67 to 83; the average 
in forty-four males is 86, in thirty-five females, 76. 
Distribution.—This subspecies, in typical form, is found 
over eastern Washington and Oregon, ranging thence east 
across Idaho to Utah, south across Nevada to eastern Cali- 
fornia in the vicinity of Mono Lake, and to northern 
Arizona. Positively identified specimens have been taken 
as follows: 
In Washington, in Stevens (Diamond Lake, Spring- 
dale), Walla Walla (Prescott, Wallulla), and Columbia 
(Humpeg Falls) counties. 
In Oregon, in Lake (Walker Lake, Buck Creek, Bridge 
Creek), Harney (Silver Creek, Burns), Malheur (River- 
side), Umatilla (Umatilla, Meacham), and Wallowa (Wal- 
lowa), counties. 
In Idaho, in Bonner (Sand Point, Hope), Kootenai, 
Shoshone (Wardner), Nez Perce (vic. Lewiston), Lemhi 
(Salmon Mountains), Washington (Weiser), Valley (Pay- 
ette Lakes), Custer (Challis Valley), Ada (Boise), Camas 
(Malad River Canyon), Blaine (Ketchum, Guyer Hot 
Springs), Butte (Arco), Jerome (Shoshone Falls), Twin 
Falls (Snake River near Salmon Falls), Cassia (Cotton- 
wood Creek, Albion), Bingham (Fort Hall), Oneida 
(Malad), and Bear Lake (Bear Lake), counties. 
In Utah, in Cache (Logan), Davis ( Woods Cross), 
Salt Lake (Fort Douglas), Wasatch (Provo Canyon), Utah 
