SPERMOPHILUS. 99 



eleven lines of white spots: beneath yellowish white. Head above 

 mixed white, black and yellowish; orbital ring and lower side of 

 cheek, white; tail, above black and yellowish white, bordered with 

 black and edged with yellowish white; beneath brownish white, 

 bordered with black, and fringed with brownish white. 



Measiiremenls. Total length, 305: tail vertebra^, 100; hind 

 foot, 42. 



a. parvidens. {Spernwphilus), Mearns, Proc. U.S.Nat. Mus.. xviii 

 1S96, p. 443. 



Type locality. Fort Clark, Kinney countj'. Texas. 



Geogr. Distr. Southwestern Texas. 



Genl. Char. Similar to ^S'. mexicanus, but smaller, colors paler, 

 teeth weak. 



Color. Pattern like S. nte.xicaniis, colors paler, under parts white; 

 hairs of tail with two black rings instead of three, and tips grayish 

 instead of yellowish; back yellowish broccoli brown. 



Measurements. Total length, 325; tail vertebrae, 130; hind 

 foot, 44. 



F. Ictidomys. 



Skull long, narrow; nasals long, broad: zj'gomata not spreading, 

 weak; tail long, more than two-thirds the length of the body and 

 head: ears small. 



Fig. 22. SPERMOPHILUS (Ictidomys) 13-lineatus. 



No. 17 Field Columbian Museum Coll. Nat. size. 



Upper tooth row. 

 Enlarged 4 times. 



Lower tooth row. 

 Enlarged 5 times. 



