. Mammals of the Mexican boundary of the United States : a descriptive catalogue of the species of mammals occurring in that region; with a general summary of the natural history, and a list of trees . Mammals; Mammals; Trees; Trees; Natural history; Natural history. 278 BULLETIN 56, UNITED STATES NATIONAL MLTSEUM. in northeastern Sonora, Mexico, and the Huachuca Mountains, southern Arizona. Characters.—Similar to typical Sciurus arisonensis, but slightly tmaller, with a broad band of gray over back of neck and shoulders, separating the median grizzled yellowish or pale rusty area into a narro


. Mammals of the Mexican boundary of the United States : a descriptive catalogue of the species of mammals occurring in that region; with a general summary of the natural history, and a list of trees . Mammals; Mammals; Trees; Trees; Natural history; Natural history. 278 BULLETIN 56, UNITED STATES NATIONAL MLTSEUM. in northeastern Sonora, Mexico, and the Huachuca Mountains, southern Arizona. Characters.—Similar to typical Sciurus arisonensis, but slightly tmaller, with a broad band of gray over back of neck and shoulders, separating the median grizzled yellowish or pale rusty area into a narrow patch on crown and ears, and a larger one on lumbar region and rump. Mamm?e: P. |, A. |, I. {. Color.—Mr. Nelson describes May specimens from the Huachuca Mountains, Arizona, as follows: Upper parts, including top of nose and base of tail, pale grizzled gray with rusty yellow wash on back of crown, lum- bar region, and rump; sides of neck, flanks, and" outside of hind legs somewhat paler than top of shoulders; fore feet and outside of legs grizzled gray- ish white, sometimes pale gray; hind feet pale grizzled gray; ring around eye whitish, or slightly huffy; sides of head whitish gray, often with postocular yellowish brown suffusion; ears dingy grayish or dull yellowish, sometimes with small patch of dull gray or rusty yellow behind base; under parts white; tail above black washed with white, heaviest along border; below, broad median area grizzled rusty, dull orange yellow or yellowish brown, with heavy black border and broad white edge. Hairs on back black, with white tips and broad yel- low subbasal or basal rings, or with subterminal huffy yellow rings, mixed with other hairs wholly black. Winter pelage similar to that of summer, but a little grayer on sides of body and'outside of legs and feet; ears more thickly haired and dull rusty, with basal patches of same color; white on tail more distinct. (Proc. Washington Acad. Sci., I, 1899, p. 9G.) Skull.—Larger tha


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