146 CITELLUS, 
SMALL-SPOTTED SPERMOPHILE. 
Type locality. Oracle, Pinal 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 vertebre, 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. Régn. Anim., 1, 1777, p. 428. 
mexicanus (Citillus), Licht., Darst. Neu. Saugeth., 1830, pl. 31, 
Fig. 2. (ex Toluca.) 
mexicanus (Spermophilus), Elliot, Syn. N. Am. Mamm., rgor, 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 vertebra, 100; hind foot, 42. 
*a,.—parvidens (Spermophilus), Mearns, Proc. U. S. Nat. Mus., 
XvitI, 1896, p. 443. Elliot, Syn. N. Am. Mamm., rgor, 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 vertebra, 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. 
