SPERMOPHILUS. 



Genl. Char. Inner black lateral band obsolete. 



Color. Above yellowish gray mixed with black and tinged with 

 vinaceous; a broad yellowish white line and one of black on each 

 side ; top of head vinaceous : sides of neck and shoulders deep och- 

 raceous ; sides straw yellow ; beneath bufly white, dusky base of 

 hairs showing through. Tail above dusky edged with fulvous ; below 

 pale fulvous bordered with black. 



Measurements. Average total length, 280; tail vertebra', 95; hind- 

 foot, 42. 



B. Ammospermophilus. 



Size small. Skull very broad for its length ; interorbital con- 

 striction very slight ; nasals short, rather broad and equal in length to 

 the premaxillaries. First premolar less than half the second in size. 

 Tail one-third the length of head and body. 



Fig. 18. Spermophilus (Ammospermophilus) leucurus. 

 .No. 21;; Field Columbian Museum Coll. Nat. si/e. 



Lower tooth row. 

 Enlarged 4 times. 



Upper tooth rov 

 Knlarged 4 tinu'S. 



104. harrisii. {Spermophilus), .\ud. >.V Bach. Oiiadr. , 1854. Ill, p. 267, 

 pi. 144. fig. I. 



Type locality. Not determined. 



Geogr. Distr. Southern I'tah and Nevada into California, and 

 south into Arizona and northwestern New Mexico. 



