. 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. MAMMALS OT? THK MEXICAN BOUNDAKY. 331 CITELLUS SPILOSOMA ARENS (Bailey).« ^ PASO SPOTTED GROUND-SaUIRREL. I'^permophilua spilosoma arem Bailey, Proc. Biol. Soc. Washington, XV, p. 118, .Inne 2, 1902 (original description). Citi'llm spilosoma arem Miller and Rehn, Proc. Bost. Soo. Nat. Hist., XXXI, No. 3, Aug. 27, 1903, p. 75 (Syst
. 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. MAMMALS OT? THK MEXICAN BOUNDAKY. 331 CITELLUS SPILOSOMA ARENS (Bailey).« ^ PASO SPOTTED GROUND-SaUIRREL. I'^permophilua spilosoma arem Bailey, Proc. Biol. Soc. Washington, XV, p. 118, .Inne 2, 1902 (original description). Citi'llm spilosoma arem Miller and Rehn, Proc. Bost. Soo. Nat. Hist., XXXI, No. 3, Aug. 27, 1903, p. 75 (Syst. Results Study N. Am. Mam. during the years 1901 and 1902). T^za (gopher) or Uron (officer) of the Mexicans. Geographical range.—Sonovan Zone, in southwestern Texas and the adjacent parts of Mexico—the Eastern Desert Tract. Description.—Size small; form slender. Tail terete at base, some- what flattened and bushy at extremity. Feet (fig. 53) small. Ears reduced to short rims. Length, 240 mm.; tail vertebrae, 80 (to end of hairs, 100); hind foot, 35; head, 43. Skull, 39 by Mammje, 5 pairs. Iris hazel. Dichromatic, with reddish and grayish color-phases. Pattern spotted above, with ill-defined white spots arranged in longitudinal series. Ground color nearly uniform vina- ceous-cinnamon, or rusty brownish gray, according to the phase of color- ation. Under surface and sides of head, except a longitudinal infra- orbital stripe, white. Tail vinaceous- cinnamon above, except at the tip, where the hairs are broadly banded with black and tipped with yellow; under surface of tail yellow. Cranial and dental characters.— Those of the subgenus Xerosfer- mophilus., constituted by Doctor Merriam for the reception of the spilosoma group, of which Citellus mohavensis (Merriam) is the type. Skull with shortened rostrum, broad nasals, narrow interpterygoid space, sharply elevated supraorbital rim, and heavy, obliquely-set teeth. The first upper premolar is much larger than in Arnm
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