CITELLUS. 143 
Color. Above grizzled gray, vinaceous on head and rump; out- 
side of legs salmon; white stripe on side of back; under parts white; 
tail above iron gray, with indistinct white border, beneath white, 
bordered with black. 
Measurements. Total length, 209; tail vertebre, 69; hind foot, 
38. Skull: occipito-nasal length, 40.5; Hensel, 18; zygomatic width, 
23.5; interorbital width, 9.5; palatal length, 18; length of upper 
molar series, 6. 
a.—peninsule (Tamias), Allen, Bull. Am. Mus. Nat. Hist., 1893, 
p- 197. 
LoweER CALIFORNIA SPERMOPHILE, 
Type locality. San Telmo, Lower California, Mexico. 
Geogr. Distr. Lower California, Mexico, range unknown. 
Genl. Char. Color darker than C. harrist; tail very short. 
Color. Upper part of back gray; top of head and lower back 
dusky or reddish brown; outside of arms and thighs reddish cinna- 
mon; lateral stripe and under parts white; tail above iron gray, 
beneath white with subapical black band. 
Measurements. Total length, 213; tail vertebrae, 50; hind foot, 
35. Skull: occipito-nasal length, 41.5; Hensel, 34; zygomatic width, 
24; interorbital width, 10; length of nasals, 10; palatal length, 19.5; 
length of upper molar series, 7; length of mandible, 19; length of 
lower molar series, 6. 
105. interpres (Tamias), Merr., N. Am. Faun., No. 4, 1890, p. 21. 
interpres (Spermophilus) Elliot, Syn. N. Am. Mamm., 1901, p. 86. 
TRADER SPERMOPHILE, 
Type locality. El Paso, El Paso County, Texas. 
Geogr. Distr. State of Chihuahua, Mexico, north to Utah. 
Genl. Char. Similar to C. leucurus; tail long; lateral hairs with 
two black bands. 
Color. Winter Pelage. Above grizzled gray tinged with vina- 
ceous; shoulder, hips, outer surface of legs ochraceous buff; white 
stripe on eyelids and on each side of back; under parts white; tail 
above grizzled gray tinged with fulvous, edge whitish, beneath 
white. 
Measurements. Total length, 226; tail vertebre, 80; hind foot, 37. 
B. Xerospermophilus. 
Size small. Skull short, broad; interorbital constriction con- 
siderable; nasals not reaching posterior ends of premaxille. First 
molar one-third the size of second. Tail one-third the length of 
body and head. 
