. Bulletin - United States National Museum. Science. MAMMALS ()!â ' THE .MI'.XKAN BOUNDARY 331 CITELLUS SPILOSOMA ARENS (Bail. EL PASO SPOTTED GROUND SQUIRREL. fipermophUus spilosoma arens Bailey, Proc. Biol. Sue. Washington, XV, p. 118, June 2, L902 (original description). (Melius spilosoma arens Miller and Rehn, Proc. Bost. Soc. Nat. Ilist., XXXI, No. 3, Aug. 27, 1903, p. 75 (Syst. Results Study N. Am. Mam. during the years 1901 and L902). Tuza (gopher) or Vron (officer) of the Mexicans. Geographical Sonoran Zone, in southwestern Texas and the adjacent parts of Mexico the Eastern Des
. Bulletin - United States National Museum. Science. MAMMALS ()!â ' THE .MI'.XKAN BOUNDARY 331 CITELLUS SPILOSOMA ARENS (Bail. EL PASO SPOTTED GROUND SQUIRREL. fipermophUus spilosoma arens Bailey, Proc. Biol. Sue. Washington, XV, p. 118, June 2, L902 (original description). (Melius spilosoma arens Miller and Rehn, Proc. Bost. Soc. Nat. Ilist., XXXI, No. 3, Aug. 27, 1903, p. 75 (Syst. Results Study N. Am. Mam. during the years 1901 and L902). Tuza (gopher) or Vron (officer) of the Mexicans. Geographical Sonoran Zone, in southwestern Texas and the adjacent parts of Mexico the Eastern Desert Tract. Description.âSize small: form slender. Tail terete at base, some- what flattened and bushy at extremity. Feet (tig. 53) small. Ears reduced to short rims. Length, 240 mm.; tail vertebrae, 80 (to end of hairs, 100); hind foot, 35; head, 4.'>. Skull, 39 by Mammae, 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 a\ ntal characters.â Those of the subgenus Xerosper- mophihis, 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-sel teeth. The first upper premolar is much larger than in Ammo- spermophilus, and about as in Citellus tereticaudus. Remarks. âThe hair is short and coarse at all ^ea^ons. In winter there is some under fur, and the under surfaces are well covered; but "The subspecific na
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