354 University of California Publications in Zoology [Vol. 10 



List and Measurements in millimeters of full-grown females of 

 Thomomys nigricans 



Total Tail Hind 

 Locality Length Vertebrae Foot 



Ilemet Lake, San Jacinto Mts. 202 71 28 



Hemet Lake, San Jacinto Mts. 185 63 25 



Ilemet Lake, San Jacinto Mts. 206 59 27 



Hemet Lake, San Jacinto Mts. 191 62 27 



Hemet Lake, San Jacinto Mts. I '.'7 55 28 



Strawberry Valley, San Jacinto Mts. 195 63 26 



Strawberry Valley, San Jacinto Mts. 200 70 28 



Strawberry Valley, San Jacinto Mts. 202 58 27 



Strawberry Valley, San Jacinto Mts. 187 66 26 



Strawberry Valley, San Jacinto Mts. 191 68 27 



Strawberry Valley, San Jacinto Mts. 207 68 28 



Thomas Mt.. San Jacinto Mts. 200 62 26 



Schain's Ranch, San Jacinto Mts. 215 <>s 29 



Schain's Ranch, San .la. -into Mts. 206 64 28 



Schain 's Ranch, San Jacinto Mts. 194 62 29 



Average of the 15 $$ 198 64 27 



Thomomys altivallis Rhoads 

 San Bernardino Mountain Gopher 



The twelve specimens of gophers referred by us to this species 

 were obtained a1 bul two localities: Tahquitz Valley, 8000 feet, 

 ten (nos. 2188 2197), and Round Valley, 9000 feet, two nos 

 1761, 1762). The latter is well within the Boreal zone and the 



former is at least high Transition. As 1 titer gopher was 



obtained above low Transition, it is evident that altivallis is the 

 Boreal representative of the genus on this mountain as it is on 

 the San Bernardino range (see Grinnell, 1908, p. 150). Not 

 one old male was secured on San Jacinto ; bul five females, as 

 shown in the accompanying table, measure close to the average 

 of San Bernardino Mountain females. In coloration both adults 

 and young are identical with corresponding pelages in the San 

 Bernardino series, save that there is more or less white on the 

 throat and belly of several of the San Jacinto skins. 



If our identification proves correct. Thomomys altivallis so 

 far as now known exists only on the San Bernardino and San 

 Jacinto mountains, with the deep San Gorgonio Pass separating 

 these two colonies. Small differences ma\ ye1 be found as a 



