794 13. COLUBRID 
1+1—1+2 in one, or 8%. The supralabials are 7—7 
in nine, or 75%; 7—8 in two, or 17%; and 8—8 in one, 
or 8%. The infralabials are 10—10 in seven, or 58%; 
9—9 in four, or 33%; and 9—10 in one, or 8%. The 
scale-rows are 19—19—17 in all. The gastrosteges vary 
in number from 157 to 168, males having from 164 to 
168, females from 157 to 166; the average in five males 
is 165.4, in seven females, 161.1. The urosteges vary 
from 74 to 87, males having from 84 to 87, females from 
74 to 79; the average in four males is 85.2, in four 
females, 76. 
Distribution—This snake inhabits the great plains, 
ranging west from Minnesota, Iowa and Missouri, to Utah 
and perhaps eastern Nevada and southern Idaho. The 
specimens at hand are insufficient to show the western 
limits of the range of this subspecies and where and how it 
meets, or merges with, or is replaced by, 7. sirtalis concin- 
nus and T. sirtalis infernalis. The last named form ranges 
east at least to the western edge of Nevada, while T. sirtalis 
concinnus seems to occur as far east as northern Idaho or, 
possibly, Montana. Many more specimens are needed from 
southern Idaho, eastern Oregon, and all parts of Nevada, 
to throw light on these questions. 
I have examined Utah specimens from Cache (Bear 
River at Logan), Davis (Woods Cross), Salt Lake (Fort 
Douglas), and Utah (Spanish Fork), counties, and it prob- 
ably is this snake which has been reported from Iron (Rush 
Lake) and Utah (Provo), counties. 
I also have specimens from Bear Lake (Bear Lake) 
County, Idaho. 
