TAMIAS. 135 
KEY TO.THE SPECIES AND SUBSPECIES. 
A. Size medium. PAGE 
a. Median dark dorsal stripe alone distinct...... Fs dorsalis 135 
b. Three dark dorsal stripes distinct; outer pair 
faint. 
a.’ Tail beneath with central area rufous..... T. obscurus 136 
b.’ Tail beneath with central area ochraceous ...T. bullert 136 
c.’ Tail beneath with central area pale yellow.T. durange 137 
d.’ Tail beneath with central area reddish 
5 EEN a ee ee are coe ee rt eae T. merriamt 13 
c. Five dark dorsal stripes distinct........ T. quadrivittatus 13 
97. dorsalis (Tamias), Baird, Proc. Acad. Nat. Scien. Phil., 1855, 
p-. 332. Elliot, Syn. N. Am. Mamm., 1go1, p. 68. 
_quadrivittatus pallidus Coues & Yarr., in Wheeler’s Rep. Geogr. 
& Geol. Expl. and Surv. West of roo Merid., v, 1876, p. 118. 
GILA CHIPMUNK. 
Type locality. Fort Webster, Grant County, New Mexico. 
Geogr. Distr. Northern Utah to northern Mexico; west to the 
Sierra Nevada; east to the Mimbres in New Mexico. 
Genl. Char. Single dorsal stripe alone conspicuous. 
Color. Upper parts hoary mixed with rusty and brown; flanks 
and hips dull rusty; dorsal stripe dark brown; a faint stripe of grayish 
on flanks; under parts dull grayish white; tail above mixed black, 
chestnut, and white, hairs chestnut at base; face with usual Tamzas 
stripes. 
Measurements. Total length, 237; tail vertebre, 105; hind foot, 
22; ear, 20. Skull: occipito-nasal length, 37; Hensel, 29; zygomatic 
width, 20; interorbital width, 9; palatal length, 16; length of upper 
molar series, 5. 
‘| 
\d 
A ; | 
A 
A 
1g 4 
iy, Ny 
ie GE; 
Lf | 
vy f 
_ Hi iF 
"f° ’ 
~"2 tee 
Fig. XXX. TAMIAS OBSCURUS. DUSKY CHIPMUNK. 
