250 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



SCIURUS ABERTI Woodhouse. 

 ABERT PINE SaUIRREL, 



Soiurus aJjerti Woodhouse, Proc. Acad. Nat. Sci. Phila., VI, 1852, p. 220 

 (original description) ; Sitgreave's Expl. Colorado and Zuni rivers, 

 1853, Mam., p. 53, pi. vi.— Audubon and Bachman, Quad. N. Am., 

 Ill, 1854, p. 262, pi. OLiii, flg. 1.— Baird, Mam. N. Am., 1857, p. 267.— 

 Allen, Proc. Bost Soc. Nat. Hist., XVI, 1864, p. 287; Monogr. N. Am. 

 Rodentia, 1877, p. 7.35; Bull. Am. Mus. Nat. Hist, VII, 1895, p. 244.— 

 CouES, Amer. Nat., I, 1867, p. 855.— Coues and Yabkow, Wheeler Surv., 

 V, Zool., 1876, p. 115. — Mereiasi, North American Fauna, No. 3, 1890, 

 p. 49.— Elliot, Field Col. Mus., Zool. Ser., II, 1901, p. 57, fig. 13 (Synop. 

 Mam. N. Am.). — Miller and Rehn, Proc. Bost. Soc. Nat. Hist, XXX, De- 

 cember, 1901, p. 31 (Syst Results Study N. Am. Mam. to close of 1900). 



Soiurus clorsalis Woodhouse, Proc. Acad. Nat Sci. Phila., VI, 1852, p. 110 

 (not 8. dorsalis of Gray). 



Sciurus castanotHS Baird, Proc. Acad. Nat Sci. Phila., VII, 1855, p. 332. 

 (Typ. error for castanonotus. From Copper Mines, New Mexico.) 



Sciurus castanonotus Baird, Mam. N. Am., 1857, p. 266; Rep. U. S. Mex. 

 Bound. Surv., II, Pt. 2, Mam. 1859, p. 35, pi. v. 



Ma-qui -lii-ta of the Hnalapai Indians of northern Arizona. 



Sglia-gliern -Uli of the Hopi Indians of northeastern Arizona. 



Type-locality. — San Francisco Mountain, Arizona. (Type, skin 

 without skull, Cat. No. 2430, U.S.N.M.) 



Geographical range. — The pine-covered plateaus and mountains of 

 northeastern Arizona, between the spruce and pinon zones, ranging 

 eastward into New Mexico. It occupies the Transition Zone. 



Description. — About the size of the northeastern gray squirrel. 

 Color plumbeous-gray above, with a broad dorsal area of reddish 

 brown ; under surfaces, including the tail, pure white ; sides of body 

 with a black line separating the gray of the upper surface from the 

 white of the under surface; tail black at tip, mixed gray and black 

 above, and white beneath. Ears long and pointed; in winter with 

 chestnut hair at base, and blackish ear tufts more than an inch in 

 length. Length, 500 mm. ; tail to end of vertebrae, 220 ; tail to end of 

 hairs, 280; length of hind foot, 73; ear from crown, 35; ear from 

 notch, 44 ; length of ear tufts, 38 ; length of head, 67 ; distance from 

 nose to eye, 31 ; nose to ear, 53. 



Cranial and dental characters. — The skull, which measures 61 by 

 36 mm. in its greatest diameters, is relatively short, convex above, 

 with generally rounded contours. The postorbital processes are 

 long and divergent, not sharply deflected as in Parasciurus. First 

 upper premolar (which I found wanting in one specimen) consider- 

 ably larg:er than the corresponding tooth in Sciurus fossor anthonyi. 

 Interpterygoid fossa short, about equaling the three upper true 

 molars. Incisive foramen short, almost as wide as long. Upper 

 molars all 3-rooted ; lower molars 4-rooted, except -the last, in which 

 the posterior pair of roots are sometimes united, as in the case of the 

 premolar. 



