110 SCIURUS. 
27.5; interorbital width, 19.9; zygomatic width, 36.4; length of upper 
molar series, I1.4. 
78. apache (Sciurus), Allen, Bull. Am. Mus. Nat. Hist., 1893, p. 29. 
Elliot, Syn. N. Am. Mamm., rgor, p. 58. 
griseiflavus Thomas, Proc. Zodl. Soc., 1882, p. 372. (nec Gray.) 
niger ludovicianus Thomas, Proc. Zodl. Soc., 1890, p. 73 (footnote). 
APACHE SQUIRREL. 
Type locality. Mountains of northwestern Chihuahua, Mexico. 
Geogr. Distr. Sierra Madre in States of western Durango, north- 
western Chihuahua, eastern Sonora, and northeastern Sinaloa, Mexico; 
also in Chiricahua Mountains, southern Arizona. 
Genl. Char. Similar in size and color to S. r. texensits Bach., but 
darker and with ferrugineous legs, and other distribution of hues. 
Color. Upper parts iron gray, usually washed with yellow; 
crown and back blackish; sides of head mixed gray, black and ful- 
vous; orbital ring buffy white or fulvous; flanks washed with pale 
yellowish; outside of legs suffused with rusty; outside of arms and 
under parts varying from buffy yellow to orange yellow; tail at 
base like back, above black washed with yellow and fringed with 
white, beneath orange or rusty rufous with a black border and 
fringed with pale yellowish; ears gray with a buff tinge; hands buffy 
or orange yellow; feet darker. 
Measurements. Total length, 565; tail vertebre, 279; hind foot, 
v9. Skull: average of five; basilar length, 56.4; palatal length, 28.7; 
interorbital width, 21.5; zygomatic width, 37.5; length of upper 
molar series, II.9. 
E. Parasciurus. 
Premolars, —. Skull: braincase narrow at occiput, not inflated 
over parietal region, long, narrow; rostrum long, broad; nasals broad; 
molar series large, heavy. 
rufiventer texensis (Sciurus), (Bach.), Proc. Zoél. Soc., 1838, p. 86. 
ludovicianus limitis Baird. Proc. Acad. Nat. Scien. Phil., 1855, 
p. 331. Elliot, Syn. N. Am. Mamm., rgot, p. 53. 
Texas Fox SQUIRREL. 
Type locality. Devil’s River, Valverde County, Texas. 
Geogr. Distr. Texas and adjacent parts of the States of Nuevo 
Leon and Coahuila, Mexico. 
Genl. Char. Smaller than S. carolinensis; hairs short and close 
pressed; upper molars four; feet small; colors pale. 
Color. Upper parts mixed cinnamon and black; sides of head, 
limbs, and under parts, light cinnamon brown; feet above tinged with 
