268 BtfLLETiN 56, -UNITED StAtES NATIONAL MuSETTM. 



Mcafnircmrnts of 22 specimens of Solnrus griseus anthonyi. 



^ American Museum of Natural History. ^ Type. 



SubgeuQS ABJBOSCITTBTTS Nelson (1899). 

 SLENDER SaurRRELS. 



ArcBOsciiirus Nelson, Proc. Washington Acad. Sci., I, p. 29, pi. i, fig. 3, May 

 9, 1899 (Revision of the Squirrels oi Mexico and Central America). 



Dentition.— I. j^; P. j^; M. gEg = 20. 

 The following is the original description : 



Type Sciurus oculatus Peters, from eastern Mexico. 



Distrihution. — Mountains bordering the table-land of Mexico from the vol- 

 canoes of Orizaba and Toluca north to central jV.rizona and west-central New 

 Mexico. Transition zone. 



External characters.— Size large ; body rather slender ; tail usually long, 

 sometimes exceeding length of head and body ; upper parts gray or yellowish ; 

 underparts white or yellowish. 



Cranial characters. — Premolars {. SliuU rather short, depressed ; brain case 

 broadened at parietals ; occiput low and broad ; front of skull depressed at base 

 of rostrum (more arched in Parasciurus) ; rostrum light; nasals narrow, 

 slightly tapering posteriorly ; upper end of premaxillre narrow. 



