300 Field Columbian Museum — Zoology, Vol. III. 



I refer this example to tins species, and it is the only one 

 preserved by Mr. Heller in this region. He writes that it was 

 "a rather rare species in the Sierras, where it was found from 

 cS.ooo to 12.000 feet elevation, or from the upper edge of the 

 Transition to the Alpine Zone above timber-line." 



THOMOMYS. 



Thomomys operarius. 



Thomomys operarius Merr., Proc. Biol. Soe. Wash., 1S97, 

 p. 215. Elliot, Syn. X. Am. Maram,, 1901, p. 223. 



14 Examples from Keeler (topotypes). 



"At Keeler this gopher is abundant on the borders of Owens 

 Lake in moist soil supporting a heavy growth of salt-grass. 

 The species is apparently restricted to this narrow zone which 

 bounds the lake." 



Thomomys fulvus. 



Thomomys fulvus Woodhouse, Proc. Acad. Nat. Scien. Phil.,- 

 1852, p. 201. Elliot, Syn. N. Am. Mamm., 1901, p. 227. 



4 Specimens: 1 Fort Tejon, 2 Bailey's Ranch, 1 north of 

 Canada de las Uvas. 



"The moist borders of creeks near Fort Tejon and about 

 Mt. Pinos are dotted with the mounds of this species. The 

 badgers have hunted it so persistently in this region that it has 

 become a very wary animal." 



Thomomys perpallidus. 



Thomomvs talpoides perpallidus Merr., Science, vui, 1886, 

 p. 588. 



Thomomys perpallidus Elliot, Syn. N. Am. Mamm., 1901, 

 p. 229. 



23 Specimens: 11 Palm Springs, 1 Whitewater, 1 Morongo 

 Pass, 1 Warren's Well, 6 Oro Grande, 2 Daggett, 1 Copper City. 



"In the irrigated fields at Palm Springs the desert gopher 

 was abundant. Farther north on the Mohave River it was 

 again met with about fields and along irrigating ditches at Oro 

 Grande and Daggett." 



Thomomys cabazonae. 



Thomomys cabazonae Merr., Proc. Biol. Soc. Wash.. 1901, p. no. 



10 Specimens: 7 Whitewater, 3 Banning (topotypes). 



This seems to be the form common in the San Gorgonio Pass, 

 and at the limit of its eastern range at Whitewater it overlaps 

 that of T. perpallidus. 



