MAMMALS OF THE MEXICAN BOUNDARY. 303 



AMMOSPERMOPHILUS HARRISII (Audubon and Bachman). 

 HARRIS GROUND-SaUIRREL, 



SpermophUxis harrisii AvjyvBOfi Sind Bachman, Quad. N. Am., Ill, 1857, p. 267, 

 pi. cxLiv, fig. 1 (original description and figure). — Baird, Main. N. Am., 

 1857, pi. xLviii, fig. 3 (skull).— CouEs, Amer. Nat., I, 1867, p. 359 (Western 

 Arizona).— Miller and Refin, Proc. Bost. Soc. Nat. Hist, XXX, No. 1, Dec. 

 27, 1901, p. 51 (Syst. Results Study N. Am. Mam. to close of 1900). 



Tamias harrisi, Allen, Monogr. N. Am. Rodentia, 1877, p. 810.— TnuE, Proc. 

 U. S. Nat. Mus., VII, 1885, p. 594. 



ISpermophilus'] harrisii, Elliot, Field'Col. Mus., Zool. Ser., II, 1901, p. 85 (Synop. 

 Mam. N. Am.). 



[Oitellus {Ammospermophilus)} harrisi, Elliot, Field Col. Mus., Zool. Ser., IV, 

 1904, p. 141 (Mam. Mid. Am.). 

 Yung-yV-uh of the Hopi Indians of northeastern Arizona. 

 Hlm-me'-dd of the Hualapai Indians of northern Arizona. 



Type-locality. — United States; exact locality unknown."^ 



Geographical range. — Sonoran Zone of the central region. On the 

 Mexican Border, the typical form occurs onlyin the central portion 

 of the Arizona section of the Boundary Line, whence its range extends 

 northward beyond the Colorado River. In the desert ranges border- 

 , ing the lower Colorado River it is represented by the subspecies 

 saxicola. 



Description. — Similar in size and color pattern to Ammospermo- 

 philus leucurus, but with a stronger coloration and a longer tail, 

 which is not white below. Length, 230 mm.; tail vertebras, 80; hind 

 foot, 40; head, 45. Skull, 40 by 23. Mammae, 6 pairs. Color above, 

 a much-grizzled mixture of black and vinaceous-cinnamon. Outer 

 surface of limbs, vinaceous-cinnamon, minutely grizzled. Under sur- 

 face and orbital circle, white. A white stripe on each side extends 

 from above the shoulder to the rump. Feet pale rusty. Tail rather 

 bushy, iron gray above and below. 



Habits and local distribution. — The Harris ground-squirrel is an 

 abundant inhabitant of the open plains and desert regions of Arizona, 

 and also invades the valleys, canyons, and river bottoms. It is the 

 characteristic ground squirrel of Arizona, which territory is its cen- 

 ter of abundance. Its range extends to all the surrounding country, 

 the outline of its habitat lying within the boundaries of California, 

 Nevada, Utah, New Mexico, and Mexico. In Arizona, it is restricted 

 to the warm countrj^ under 5,200 feet in altitude, its vertical range 

 corresponding, above, to the belt of cedar forests, although in certain 

 instances it possibly extends through the cedars into the zone of 

 rough-barked junipers which precedes the pine; but I have never met 

 with it so high up. With the above definition of its range, it is 

 unnecessary to enumerate the localities in which it has been found. 



a See Merriam, North American Fauna, No. 2, Oct. 30, 1889, pp. 19, 20. 



