412 BUULiETIN 128, UNITED STATES NATION.VL MUSEUM. 



Microtus calif oraicus mohavensis— Continued. 



Range. ^Known only from a limited area along the Mohave 

 River, in San Bernardino County, from Victorville to Oro 

 Grande. Vertical range from 2,500 feet up at least to 2,700 

 feet; zonal range, Lower Sonoran. 



*Microtus califoraicus sanctidiegi R. Kellogg. 



1918. Microtus californicus neglectus R. Kellogg, Univ. Calif. 



Publ. Zool., vol. 21, p. 31. December 28, 1918. (Not of 



Jenyns, 1841.) 

 1922. Microtus californicus sanctidiegi R. Kellogg, Proc. Biol. 



Soc. Washington, vol. 35, p. 78. March 20, 1922. (Substitute 



for neglectus R. Kellogg.) 

 Type Locality. — Escondido, San Diego County, California. 



Altitude, 640 feet. 

 Range. — San Diegan faunal district from Mountain Spring and 



mouth of Tiajuana River, San Diego County, northwest to 



Gaviota Pass, Santa Barbara County, and north to Bluff Lake, 



San Bernardino Mountains, San Bernardino County. Vertical 



range from sea level up at least to 9,000 feet; zonal range 



Lower Sonoran to Canadian. 



*Microtus californicus huperuthrus Elliot. 



1903. Microtus californicus huperuthrus Elliot, Field Columb. 



Mus., publ. 74, zool. ser., vol. 3, p. 161. April ,1903. 

 Type Locality. — La GruUa, San Pedro Martir Mountains, Lower 



California, Mexico. (See Elliot, Cat. Mamm. Field Mus., op. 



292, 1907.) 

 Range. — Lower California, Mexico, from San Quintin, on the 



seacoast, east to La Grulla and Aguaje de las Fresas, in the 



San Pedro Martir Mountains. Vertical range from sea level 



up to at least 8,500 feet; zonal range from Lower Sonoran 



to Transition. 



operarius-growp. 



t*Microtus operarius operarius (Nelson). 



1893. Arvicola operarius Nelson, Proc. Biol. Soc. Washington, 



vol. 8, p. 139. December 28, 1893. 

 1897. [Microtus] operarius Trouessart, Catal. Mamm. viv. foss., 



p. 564. 

 Type Locality. — St. Michael, Norton Sound, Alaska. 

 Range. — Barren grounds about Bristol Bay, St. Michael, and 



Kowak River, Alaska. 



t*Microtus operarius endoecus Osgood. 



1909. Microtus operarius endoscus Osgood, North Amer. Fauna, 



No. 30, p. 23. October 7, 1909. 

 Type Locality. — Mouth of Charlie Creek, Yukon River, about 



50 miles above Circle, Alaska. 



