108 SCIURUS. 



Genl. Char. Similar to 5. oculatus, but paler. Skull: nasals 

 narrow. 



Color. Top of head and back gray, washed with blackish; flanks 

 and outside of arms and legs grizzled gray, tinged with yellowish; 

 orbital ring grayish white; sides of head and ears gray, tinged with 

 buff; white basal patches on ears; under parts whitish; hands and 

 feet grayish white, tinged with buff; tail black above, washed with 

 white, beneath yellowish gray or brown, bordered with black and 

 edged with white. 



Measurements. Total length, 520; tail vertebrae, 260; hind foot, 

 66. Skull: average of two; basilar length, 54; palatal length, 29; 

 interorbital width, 20.5 ; zygomatic width, 36.7 ; length of upper molar 

 series, n. 



75. alleni (Sciurus), Nelson, Proc. Biol. Soc. Wash., xn, 



p. 147- 



carolinensist Baird, N. Am. Mamm., 1857, p. 263. 



carolinensis Allen, Mon. N. Am. Roden., 1877, p. 706. 



carolinensis Alston, Proc. Zool. Soc., 1878, p. 658. 



arizonensis Allen, Bull. Am. Mus. Nat. Hist., N. Y., 1891, p. 222. 



(Part.) 

 ALLEN'S SQUIRREL. 



Type locality. Monterey, State of Nuevo Leon, Mexico. 



Geogr. Distr. From Monterey, State of Nuevo Leon, into State of 

 Tamaulipas, Mexico. Altitude, 2,000-8,500 feet. 



Genl. Char. Similar to S. carolinensis, back uniform in color. 



Color. Above grizzled yellowish brown, grayest on flanks; arms, 

 hands, and feet whitish gray; thighs like flanks; orbital ring whitish; 

 under parts white ; faint grayish lateral line ; tail like back all around 

 the base, above black washed with white, beneath grizzled yellowish 

 gray, bordered with black and edged with white; ears brownish gray. 



Measurements. Total length, 471; tail vertebras, 217; hind foot, 

 60. Skull: average of five; basilar length, 50.4; palatal length, 26.3; 

 interorbital width, 18.4; zygomatic width, 33.7; length of upper 

 molar series, 10.3. 



76. nayaritensis (Sciurus), Allen, Bull. Am. Mus. Nat. Hist., N. Y., 



1890, p. vii, footnote, and p. 185. 

 alstoni Allen, Bull. Am. Mus. Nat. Hist., N. Y., 1889, p. 167. (nee 



Anderson.) 

 NAYARIT SQUIRREL. 



Type locality. Sierra de Valparaiso, State of Zacatecas, Mexico. 

 Geogr. Distr. States of Jalisco and Zacatecas, Mexico. 

 Genl. Char. Similar to S. griseiflavus ; ears high and broad. 



