250 BULLETIN 5G, UNITED STATES NATIONAL MUSEUM. 



SCIURUS ABERTI Woodhouse. 

 ABERT PINE saXTIRREL. 



Sciuru.^ ahcrti Woodhouse. I'roc. Acad. Nat. Sci. Phila.. VI, 1852. p. 220 

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

 1853, Mam., j). 5,-!. pi. vi. — Audubon and Bachman, Quad. N. Am., 

 Ill, 1854, p. 262, pi. CLiii. fig. 1.— Baird, Mam. N. Am.. 1857, p. 207.— 

 Allen, Proc. Bost. Soc. Nat. Hist, XVI, 18G4, p. 287; Monogr. N. Am. 

 Rodentia, 1877, p. 735; Bull. Am. Mus. Nat. Hist., VII, 1895. p. 244.— 

 CouES, Amer. Nat., I, 1867, p. 355. — Coues and Yarrow, Wheeler Surv., 

 V, Zool., 1876, p. 115. — Merriam, 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). 



Sciurus dorsalis Woodhouse, Proc. Acad. Nat. Sci. Phila., VI, 1852, p. 110 

 (not S. dorsalis of Gray). 



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

 (Typ. error for castanonottis. 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. 



Md-qui -hi-fd of the Hnalapai Indians of northern Arizona. 



SQlia-(jhcni -iVi of the Ilopi Indians of northeastern Arizona. 



Type-Ioci/Jifi/. — San Francisco Mountain, Arizona. (Typo, skin 

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



Geog7'aphkal I'ange. — The pine-covered plateaus and mountains of 

 northeastern Arizona, between the spruce and pihon zones, ranging 

 eastward into New Mexico. It occupies the Transition Zone. 



Descriftioii.—khoui the size of the northeastern gray squirrel. 

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

 broAvn : 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 vertebra?, 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 charaxters. — The skull, which measures 01 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 PaiYii^ciurus. First 

 upper premolar (which 1 found Avanting in one specimen) consider- 

 ably larger than the corresponding tooth in Seiitrus fossor anthonyi. 

 Inter]3terygoid fossa short, abo*it 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. 



