122 University of California Publications in Zoology [| Vou. 17 
rounded as in the type or pointed as in boylii; in some specimens it 1s 
as wide as in the narrowest boyli. 
This seems to be the subspecies of boylii which approaches most 
closely to the species pretiosa. A few specimens can be found in which 
the vomerine teeth are confined to the ends of sight swellings on the 
vomerine ridges, much as in pretiosa (see fig. 1); the outline of the 
head is in some specimens the same as in pretiosa, and the short hind 
leg carries the resemblance still farther. The dorsal color pattern, 
while usually quite different from that in pretiosa, suggests the latter 
in an occasional individual. I am inclined to place sierrae with boylw 
on account of the character of the vomerine teeth in most of the speci- 
mens (see figs. 1-3), the usual absence of distinct dorso-lateral folds, 
the mottling of the upper lip, the lack of red in the coloration of the 
Fig. 1—Inside of mouth of Rana pretiosa pretiosa, no. 5566, Mus. Vert. Zool.; 
note vomerine teeth restricted to inner, expanded ends of oblique ridges, and 
the large maxillary and premaxillary teeth. 
Fig. 2.—Inside of mouth of Rana boylii sierrae, no. 3734, Mus. Vert. Zool.; 
note resemblance of teeth to those of R. b. boylii. 
Fig. 3—Inside of mouth of Rana boylii boylii, no. 6100, Mus. Vert. Zool.; 
note vomerine teeth on whole length of oblique ridges and small teeth of upper 
jaw. All X 114. 
under parts, and the suggestion of a white, anterior head-patch in 
seven or eight out of the 150 specimens examined. 
Remarks.—This is the only species of frog known to occur above 
7000 feet altitude in the Sierra Nevada. Its range is the entire south- 
ern half of those mountains, at least from the Yosemite National Park 
on the north to southern Tulare County on the south. It inhabits 
meadows, streams and lakes from about 7000 to 10,500 feet in the 
Yosemite Park, and to 11,500 feet near Mount Whitney. In some of 
the lakes it was found in great numbers, appearing as soon as the ice 
had melted in late June. The tadpoles were at this time of large size 
and must have been hatched from eggs of a laying not more recent 
than the previous year. 
