Vor. III] VAN DENBURGH—REPTILES—OREGON, IDAHO, AND UTAH 157 
adults, this difference is somewhat less marked, for while the 
colors of P. douglassii seem to become more intense with age, 
those of P. platyrhinos seem to fade. The largest specimens 
are 84, 87, and 90 mm. long; the smallest, 33 mm. 
These specimens were secured on the sage-brush plains near 
Conant, Cassia County, Aug. 21, 1894; near Cottonwood 
Creek, Cassia County, Aug. 23, 1894; at Arco, Alturas County, 
Aug. 23, 1894; and at American Falls, Snake River, Aug. 25, 
1894. It has also been secured at Grant’s, Oregon, by Mr. 
Gilbert Edgington. 
8. .Phrynosoma platyrhinos Girard.—Numerous specimens 
of this horned-toad were secured on the plains across the river 
from Glen’s Ferry, Aug. 8, 1894; on the plains between Bliss 
and Snake River, Aug. 10, 1894; sage-plains between Sho- 
shone and Blue Lakes, Logan County, Aug. 12, 1894; on sage- 
plain near Blue Lakes, Logan County, Aug. 16, 1894; and 
near Cottonwood Creek, Cassia County, Idaho, Aug. 23, 1894. 
In one of these specimens there is no trace of an enlarged 
series of gular scales. The majority have these series repre- 
sented, on one or both sides, by a few scales slightly larger 
than those around them. One specimen has the series fairly 
well developed. The same differences exist in specimens from 
Arizona and southern California. Two specimens have naked 
tympana, but in the others the tympana are fully scaled. The 
number of femoral pores ranges from eight to twelve. 
9. Gerrhonotus scincicauda (Skilton).—A single specimen, 
secured at Drain, Douglas County, Oregon, June 26, 1894, is 
unquestionably referable to this species. 
10. Cnemidophorus tigris B. & G.—This lizard is repre- 
sented in the collection by nine typical specimens, only one of 
which has the throat and chest strongly tinged with black. 
The dorsal color-pattern is not more distinct in young than in 
adults. These specimens were secured at Glen’s Ferry, Aug. 8, 
1894; Blue Lakes Canon, Logan County, Aug. 13, 1894; 
south side of the cafon between Shoshone Falls and Twin 
Falls, Snake River, Aug. 15, 1894; on sage-plain near Blue 
Lakes, Logan County, Aug. 16, 1894; Snake River plains by 
Upper Salmon Falls, Aug. 9, 1894. 
11. Bascanion teniatum Hallowell.—A fine specimen of this 
racer was obtained on the plains between Snake River and 
