. Fig. 65. Distribution of Reithrodontomys mega- lotis in Colorado. 1. R. m. aztecus. 2. R. m. dychei. 3. R. m. megalotis. For explanation of symbols, see p. 9. Great Plains, and their arrangement of sub- species is generally followed herein. Reithrodontomys megalotis aztecus J. A. Allen Reithrodontomys aztecus J. A. Allen, Bull. Amer. Mus. Nat. Hist., 5:79, 28 April 1893; type locality, La Plata, San Juan Co., New Mexico. Reithrodontomys megalotis aztecus, A. H. Howell, N. Amer. Fauna, 36:30, 5 June 1914. Reithrodontomys megalotis caryi A. H. Howell, Jour. Mamm., 16:143, 15 May 1935; type loc
. Fig. 65. Distribution of Reithrodontomys mega- lotis in Colorado. 1. R. m. aztecus. 2. R. m. dychei. 3. R. m. megalotis. For explanation of symbols, see p. 9. Great Plains, and their arrangement of sub- species is generally followed herein. Reithrodontomys megalotis aztecus J. A. Allen Reithrodontomys aztecus J. A. Allen, Bull. Amer. Mus. Nat. Hist., 5:79, 28 April 1893; type locality, La Plata, San Juan Co., New Mexico. Reithrodontomys megalotis aztecus, A. H. Howell, N. Amer. Fauna, 36:30, 5 June 1914. Reithrodontomys megalotis caryi A. H. Howell, Jour. Mamm., 16:143, 15 May 1935; type locality, Medano Ranch, 15 mi. NE Mosca, Alamosa Co., Colo- rado (regarded as inseparable from R. m. aztecus by Jones and Mursaloglu, 1961:19). Distribution in Colorado.—Southeastern part of the state, San Luis Valley, and western valleys south of Book Cliffs and Roan Plateau (Fig. 65). Comparisons.—From R. m. dychei, the subspecies of northeastern Colorado and ad- jacent areas, R. m. aztecus differs in generally paler color (less heavily washed with black), longer tail and ear, and longer, relatively nar- rower rostrum. For detailed comparison, see Jones and Mursaloglu (1961:22). For com- parison with R. m. megalotis, see account of that subspecies. Measurements.—Mean (and extreme) ex- ternal measurements of six males, followed by those of five females, all from Alamosa County, are: (117-142), (118-142); (52-69), (50-64); (16-17),
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