146 CITELLUS. 



SMALL-SPOTTED SPERMOPHILE. 



Type locality. Oracle, Final County, Arizona. 



Geogr. Distr. State of Sonora, Mexico, north to Arizona. 



Genl. Char. Size medium; dorsal spots large, separate, distinct. 



Color. Above russet brown; dorsal spots white bordered poste- 

 riorly with dusky; under parts whitish; tail above, basal half like 

 back, remainder mixed buff and black, bordered with buff, beneath 

 pale ochraceous buff, with indistinct submarginal black band. 



Measurements. Total length, 220; tail vertebrae, 74; hind foot, 

 30. Skull: occipito-nasal length, 36; Hensel, 27; zygomatic width, 

 21.5; interorbital width, 7; palatal length, 16; length of upper molar 

 series, 7. 



109. mexicanus (Sciurus), Erxl., Syst. Regn. Anim., i, 1777, p. 428. 



mexicanus (Citillus}, Licht., Darst. Neu. Saugeth., 1830, pi. 31, 

 Fig. 2. (ex Toluca.) 



mexicanus (Spermophilus}, Elliot, Syn. N. Am. Mamm., 1901, p. 98. 

 MEXICAN SPERMOPHILE. Urion, Huron, in Mexico. 



Type locality. Toluca, Mexico. 



Geogr. Distr. South central Mexico. 



Genl. Char. Tail about half as long as body; ears short; size 

 medium. 



Color. Above dark yellowish to reddish brown, with nine or 

 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, bor- 

 dered with black, and fringed with brownish white. 



Measurements. Total length, 305 ; tail vertebrae, 100; hind foot, 42. 



*a. paTvidens (Spermophilus}, Mearns, Proc. U. S. Nat. Mus., 

 xvni, 1896, p. 443. Elliot, Syn. N. Am. Mamm., 1901, p. 99. 

 SMALL-TOOTHED SPERMOPHILE. 



Type locality. Fort Clark, Kinney County, Texas. 



Geogr. Distr. Texas into Mexico ? 



Genl. Char. Similar to C. mexicanus, but smaller; colors paler; 

 teeth weak. 



Color. Pattern like C. mexicanus, 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. Skull: occipito-nasal length, 41; Hensel, 19; zygomatic width, 



*This form doubtless passes the Mexican boundary, but up to the present 

 time it has not been recorded from that country. 



