K-J CITELLUS. 



mixed with white hairs and narrowly edged with white, beneath sil- 

 very white at base, remainder buff mixed with black, bordered and 

 tipped with black and narrowly fringed with 'white. Ear very small, 

 similar in color to the back. 



Measurements. Total length, 252; tail vertebras, 89; hind foot, 

 35; ear, 8.5. Skull: total length, 36; occipito-nasal length, 35; 

 Hensel, 30; zygomatic width, 23; interorbital constriction, 9.5; 

 palatal length, 17; length of nasals, 12; length of upper tooth row, 7; 

 length of mandible, 2.5; of lower tooth row, 7. 



195. Citellus tereticaudus (Baircl). 



Spennophilus tereticaudus Baird, N. Am. Mamm., 1857, p. 315. 

 Elliot, Syn. N. Am. Mamm., F. C. M. Pub., n, 1901, p. 98. 

 Zool. Ser. 

 Citellus teretii;iit<hts Elliot, Mamm. Middle Amer. & W. Indies, 



F. C. M. Pub., iv, Pt. i, 1904, p. 144. Zool. Ser. 

 ROUND-TAILED SPERMOPHILE. 



Type locality. Old Fort Yuma, San Diego County, California. 

 Geogr. Distr. Central California to Tucson Plain, Arizona; Lower 

 California and State of Sonora, Mexico. 



a. Ci/fl/iin It-ri'tictiiKl UK niolitiri'iix'iH (Merriam). 



Spermophilus mohavensis Merr., N. Am. Faun., No. 2, 1889, p. 15. 

 Elliot, Syn. X. Am. Mamm., F. C. M. Pub., n, 1901, p. 98. 

 Zool. Ser. 

 Citellus tere'icaudus mohavensis Elliot, Pub. Field Columb. Mus., 



in, 1903, p. 291. Zool. Ser. 

 MOHAVE DESERT SPERMOPHILE. 



7 >/><.' A'I iility. Mohave River, San Bernardino County, California. 

 Geogr. Distr. Mohave Desert, California. 



l>. Cili'lliiK tereticaudus sofioriensis (Ward). 



Spernii'pliilits soiioricnxis Ward, Amer. Nat., XXV, 1891, p. 158. 

 Citellus li-rrli, tiitihts souorieusis Elliot, .Mamm. Middle- Amer. & 



\V. Indies, F. C. M. Pub., iv, Pt. i, 1904, p. 144. Zool. Ser. 

 SONORAN SPERMOPHILE. 



Y'r/v loiiilily. Hermosillo. State of Sonora. Mexico. 

 Geogr. Distr. State of Sonora. Range unknown. 



196. Citellus perotensis (Merriam). 



Speniii'pliilns /vn>/r//.s/'.v Merr., Proc. l!i<>l. Soc. Wash., VIII, 1893, 



I'. '.>>. 



Citellus perotensis IClliot. Mamm. Middle Amer. i!v W. Indies, 

 F. C. M. Pul>., iv. Pt. i, 1904, |". 145. Xo'il. Ser. 



