Vol. XXI, pp. 145-148 June 9, 1908 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 

 FOUR NEW RODENTS FROM CALIFORNIA. 



Among the California mammals remaining undescribed in the 



collection of the Biological Survey are two Pocket Gophers from 

 the Sierra foothills, and two Meadow Mice — one, a representative 

 of the mordax group, from the San Bernardino Mountains in 

 Southern California, the other, a member of the subgenus 

 Chilotus, from South Yolla Bully Mountain, a high summit of 

 the inner Coast Range west of the Sacramento Valley. The new 

 forms may be known from the following descriptions: 

 Microtus mordax bernardinus subsp. nov. 



Type from Dry Lake, San Bernardino Mountains, California (altitude 

 9,000 feet, at north base San Gorgonio Teak). No. 150,632, U. S. National 

 Museum, Biological Survey Collection. cTad. Collected August21, 1907, 

 by Vernon Bailey. Original No. s74'.». 



Characters. — Similar externally to M. mordax. 



Cranial characters. — Skull, contrasted with that of mordax, somewhat 

 heavier and more angular; zygomata stronger and more spreading, nasals 

 longer, broader anteriorly ; frontal anteriorly more elevated and broader, 

 with nasal and zygomatic processes (especially the latter) much more 

 strongly developed. 



Measurements of type specimen (in flesh). — Total length, 180 mm. ; tail 

 vertebra?, 56; hind foot, 21. x 



Remarks. — The Biological Survey has specimens of this form collected 

 by Frank Stephens in August, 1903, on the ridge south of Bear Lake (alti- 

 tude 7,800 feet), and from the same locality collected by Vernon Bailey in 

 August, 1907, in addition to those from the type locality at north base of 

 San Gorgonio Peak ( also known as Gray back ) . I have seen two additional 

 specimens, collected by Joseph Grinnell, from South Fork Santa Ana 



Kiver. 



Microtus oregoni adocetus subsp. nov. 



Type from South Yolla Bolly Mountain, California. No. 137,995, U. S. 



National Museum, Biological Survey Collection, c? ad. Collected July 30, 

 1905, by A. S. Bunnell. Original No. 135. 



21— Peoc. Biol. Soc. Wash., Vol. XXI, 1908. (145) 



