110 SCIURUS. 



27.5; interorbital width, 19.9; zygomatic width, 36.4; length of upper 

 molar series, 11.4. 



78. apache (Sciurus), Allen, Bull. Am. Mus. Nat. Hist., 1893, p. 29. 



Elliot, Syn. N. Am. Mamm., 1901, p. 58. 



griseiflavus Thomas, Proc. Zool. Soc., 1882, p. 372. (nee Gray.) 



niger ludovicianus Thomas, Proc. Zool. 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 5. r. texensis 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 vertebrae, 279; hind foot, 



79. 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, 11.9. 



E. Parasciurus. 



Premolars, j^. 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. Zool. Soc., 1838, p. 86. 



liidovicianus limitis Baird. Proc. Acad. Nat. Scien. Phil., 1855, 



p. 331. Elliot, Syn. N. Am. Mamm., 1901, 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 



