30 CITELLUS. 



29.4; intertemporal width, 12.8; length of nasals, 15.5; length of upper 

 molar series, 9; length of mandible, 26.2; length of lower tooth row, 

 7.9. Ex type in United States National Museum. 



Citellus lateralis arizonensis (Bailey). 



Callospermopliilus lateralis arizonensis Bailey, Proc. Biol. Soc. 

 Wash., XXVI, 1913, p. iso. 



Type locality . San Francisco Mountains, Arizona. 



Gen'. Char. Larger than C. lateralis; somewhat darker in color, 

 chestnut of thighs extending over feet to toes. 



Color. Head and shoulders suffused with golden-chestnut ; upper- 

 parts brownish gray; on each flank is a broad black and buff stripe; 

 rump and outer side of thighs deep chestnut grading to yellowish and 

 becoming buffy on the feet; underparts whitish; tail similar to that 

 of lateralis. Ex type in United States National Museum. 



Measurements. Total length, 292; tail, 102; hind foot, 44. Skull: 

 Occipito-nasal length, 45.9; Hensel, 38.4; zygomatic width, 28.5; 

 intertemporal width, 12.1; length of nasals, 16; palatal length, 21.5; 

 length of upper molar series, 8.5; length of mandible. 22.3; length of 

 lower molar series, 8.2. Ex type in United States National Museum. 



Mr. Bailey says the tail "beneath always gray." I did not find 

 this to be so on comparing a series of the present form with one of C 

 lalcralis. The last-named species is paler than the present race gen- 

 erally, and the hind feet are much paler than the thighs, while the feet 

 and thighs of this race are of the same color. 



Subgenus E. Colobotis. 



Citellus idahoensis Merriam. 



Citellus idalioi-nsis Merr., Proc. Biol. Soc. Wash., XXVI, 1913, p. 



135- 

 Type locality. Payette, at junction of Payette and Snake River. 



Idaho. Type in United States National Museum. 



C.niL Char. Largest of the C. tnollis group. 



Color. Two phases of pelage: Biiff. Top of head reddish; upper 

 part of body suffused with pale huffy fulvous, the back spotted with 

 buff; underparts buffy white; tail dark fulvous, with broad subapical 

 black band; hands and feet buffy. Gray. Top of head grizzled gray ; 

 upp<Tpart:-- 1' ;i ' ( ' hoary gray, witli a tinge of pale huffy, and the back 

 dappled with whitish; tail like hack, with black terminal hand; eye- 

 lids white; hands and feet whitish; anterior rims of ears white. I->x 

 tvpein L'niteil States National Museum. 



