Thomomys bottae pervagus, Goldman, Proc. Biol. Soc. Washington, 48:157, October 31, 1935.
Thomomys fulvus pervagus, Bailey, N. Amer. Fauna, 39:82, November 15, 1915.
Holotype.—Adult male, skin and skull, number 58293, United States National Museum, Espanola, Rio Arriba County, New Mexico, obtained by J. Alden Loring, January 4, 1894.
Distribution.—Upper Rio Grande and San Luis valleys of the Southern Rocky Mountains, in northern New Mexico and southern Colorado (see fig. 1).
Distinctive characters.—Yellowish Red (5YR 4/6); size large (see measurements); posterior tongues of premaxillae long, thin, and acuminate; nasals long, thin, posterior margins usually forming a wide V (see fig. 4); bullae rounded ventrally; interpterygoid space V-shaped, lacking median spicule.
Comparisons.—From T. b. aureus, T. b. pervagus differs as follows: reddish, never yellowish or blackish; posterior tongues of premaxillae thin and not deeply serrated; posterior margins of nasals forming a shallow V; interpterygoid space V-shaped, lacking a median spicule; basioccipital narrow. For comparisons with T. b. internatus, T. b. cultellus, and T. b. rubidus, see accounts of those subspecies.
Remarks.—T. b. pervagus is a well-defined subspecies. There is little variation between the topotypes and specimens from Colorado.
Specimens examined.—Total 20. Colorado: Conejos Co.: Antonito, 5 (USNM); 7 mi. E Antonito, 2 (USNM); 12 mi. E Antonito, 1 (USNM); Conejos River, 6 mi. W Antonito, 8300 ft., 2 (USNM). New Mexico: Rio Arriba Co.: Espanola, 10 (USNM).
Thomomys bottae internatus Goldman
Thomomys bottae internatus Goldman, Jour. Washington Acad. Sci., 26:115, March 15, 1936; Warren, Mammals of Colorado, p. 160, 1942; Kelson, Univ. Kansas Publ., Mus. Nat. Hist., 5:63, October 1, 1951.