MAMMALS OF THK MEXICAN BOUNDARY. 31 5 



OTOSPERMOPHILUS GRAMMURUS (Say). 

 ROCK SaUIRREL; CANYON-SaUIRREL. 



Sriurus (j/rammnrux Say, Long'n Expedition t(j the Rocky Mountains, 11, 1823, 

 p. 72 (original description). 



SperuiophiluK grammurus, Bachman, Charlesworth's Magazine Nat. Hist., Ill, 

 1839, p. 390.— Baird, Proc. Acad. Nat. Sci. Phila., 1855, p. 334; Mam. N. 

 Amer., 1857, p. 310, pi. iv (animal); Rep. U. S. and Mex. Bound. Surv., 

 II, Pt. 2, 1859, p. 38.— CouES, Amer. Nat., I, 1867, p. 360; Proc. Acad. Nat. 

 Sci. Phila., 1867, p. 135.— Merkiam, U. S. Geol. Surv. Terr. 6th Ann. Rept, 

 1873, p. 663.— CouEs and Yarrow, Wheeler Surv., V, Zool., 1875, p. 121.— 

 Allen, Bull. Am. Mus. Nat. Ili.st., Ill, p. 223, No. 2, April 29, 1891 (Presi<Ho 

 County, Texas). — Miller and Rehn, Proc. Bost. Soc. Nat. Hist., XXX, 

 No. 1, Dec. 27, 1901, p. 49. 



Spermoplnlua {Otospermophilus) grammurus, Elliot, Field Col. Mus., Zool. Ser., 

 II, 1901, fig. 19 (Synop. Mam. N. Am.). 



[_OiteUus {Otospermophilus) variegatusi grammurus, Elliot, Field Col. Mus., Zool., 

 Ser., IV, 1904, p. 149 (Mam. Mid. Am.). 



Hlm-me^ -le-dd of the Hualapai Indians of northern Arizona. 



Lii-cd^-nd of the Hopi Indians of northeastern Arizona. Rocky Mountain line- 

 tailed spermophile of authors. 



Type-locality. — Headwaters of the Arkan.sas River, now within the 

 State of Ct)lorado. 



Geographical range. — Sonoran, Transition, and Lower Boreal zones 

 of the southern interior region; from the upper Rio Grande Valley 

 west to La Osa (Monument No. 140), at the eastern edge of the Western 

 Desert Tract. 



Description. — Size large (larger than the eastern gray squirrel); with 

 large ears, a stout body, and a bushy tail. Mamm*, 5 pairs. Not striped. 

 Color above grayish; below yellowish white. The upper surface is a 

 coarse mixture of black and grayish or brownish white, the hairs being 

 blackish at base and tip and ringed with whitish in the middle portion, 

 the arrangement of the annuli being such as to produce a vermiculate pat- 

 tern. Top of head and ears much mixed with black. Anterior portion 

 of body usually clear grayish; posterior portion more or less washed with 

 yellowish brown. Tail grizzled black and white, the hairs thrice banded 

 with blackish and thrice with whitish, the tips being whitish. Feet and 

 chin brownish white. Orbital circle and under surface of body yel- 

 lowish white at surface, plumbeous at base of hairs. Length, 490 mm. ; 

 tail vertebra3, 220; hind foot, ()2; ear above crown, 19; ear above notch, 

 25; length of head, 70. Skull, 62 by 37 mm. in greatest diameters. 



Rertiarlis. — The summer pelage is not materialh' ditiorent from that of 

 winter. The winter pelage appears to be worn until near the end of 

 Jul}^" though molting })egins about the second week of July and con- 

 tinuesthrough August, Only a few individuals have acquired the per- 

 fect summer pelage by August 20, and one female had not completed the 

 change by September 16. This change takes place in masses. In August 



« Females containing young were killed June 14 and 27. 



