. Distribution of mammals in Colorado. Mammals. 188 MONOGRAPH MUSEUM OF NATURAL HISTORY NO. 3. Fig. 64. Distribution of Reithrodontomys mon- tanus in Colorado. 1. R. m. albescens. 2. R. m. mon- tanus. For explanation of symbols, see p. 9. Measurements.—External measurements of three males from eastern Yuma County, three young adult males from southern Washington County, and a male from northern Las Animas County are, respectively: 136, 132, 127, 119, 121, 111, 128; 67, 59, 53, 52, 58, 52, 62; 16, 17, 15, 17, 17, —, 16; 14, 13, 12, 16, 16, 14, 15; weights, , , , , —, , —. Ex-
. Distribution of mammals in Colorado. Mammals. 188 MONOGRAPH MUSEUM OF NATURAL HISTORY NO. 3. Fig. 64. Distribution of Reithrodontomys mon- tanus in Colorado. 1. R. m. albescens. 2. R. m. mon- tanus. For explanation of symbols, see p. 9. Measurements.—External measurements of three males from eastern Yuma County, three young adult males from southern Washington County, and a male from northern Las Animas County are, respectively: 136, 132, 127, 119, 121, 111, 128; 67, 59, 53, 52, 58, 52, 62; 16, 17, 15, 17, 17, —, 16; 14, 13, 12, 16, 16, 14, 15; weights, , , , , —, , —. Ex- ternal measurements of a female from north- em Logan County are: 122, 53, 16,14. Repre- sentative cranial measurements are presented in table 18. Remarks.—Smith (1964: 19) tentatively maintained the subspecific status of R. m. albescens, but expressed the opinion that al- bescens and montanus may be found insepa- rable when adequate material is available from the western part of the range of the species. The pronounced differences between albescens and montanus noted by A. H. How- ell (1914:22, 24) are artifactual, resulting from identification of a series of specimens from Medano Ranch, near San Luis Lakes, with montanus. Renson (1935a: 141) correctly iden- tified these specimens as R. megalotis. The population subsequently was recognized as a distinct subspecies, Reithrodontomys mega- lotis caryi by Howell (1935:143), but Jones and Mursaloglu (1961:19) considered caryi to be a synonym of the earlier-named R. m. aztecus. Two males (skulls only, KU 116772-73) from Yuma County are larger externally and cranially than other specimens of montanus examined. The skulls are considerably shorter, however, than undoubted examples of mega- TABLE 18 Selected cranial measurements of two species of Reithrodontomys. Number aver- Greatest Condylo- Inter- Depth Length of aged (or catalog length of basal Zygomatic Cranial orbital of maxillary number), sex skull length breadth breadth
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