PROCEEDINGS 
OF THE 
CALIFORNIA ACADEMY OF SCIENCES 
FourTH SERIES 
VoL. III, pp. 155-160 January 17, 1912 
NOTES ON SOME REPTILES AND AMPHIBIANS 
FROM OREGON, IDAHO AND UTAH 
BY JOHN VAN DENBURGH 
Curator of the Department of Herpetology 
The following notes are based upon material secured in 
1894, by Dr. Charles H. Gilbert, of Leland Stanford Junior 
University. While the number of species is not large, the data 
on distribution are of considerable interest to the student of 
zoogeography, for the herpetology of Idaho is but little known. 
I am indebted to Dr. Gilbert for the privilege of reporting 
upon the collection. 
1. Clemmys marmorata (B. & G.).—A single specimen of 
this turtle was taken at Klamath Falls, Oregon, June 16, 1894. 
2. Crotaphytus wislizenii B. & G.—Twenty-seven adult 
specimens of this fine lizard agree perfectly, both in dimensions 
and coloration, with this form as distinguished from Crota- 
phytus silus Stejneger of the San Joaquin Valley, California. 
Three very young specimens, however, have dimensions and 
coloration very nearly as in C. silus; but that form is not based 
upon immature individuals. The dorsal markings, both lines 
and spots, have a tendency to disappear in old individuals. 
Usually the lines fade first, leaving the spots fairly distinct ; 
but the reverse order of disappearance may occur. Thus is 
formed a great series of color-patterns. 
These specimens were all collected in Idaho:—at Weiser, 
Washington County, Aug. 6, 1894; plains of Snake River, by 
Upper Salmon Falls, Aug. 9, 1894; plains on south side of 
January 15, 1912 
