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Records of occurrence.—Specimens examined, the holotype and one topotype.

Remarks.—The type and one topotype so far as we know are the only specimens of this species to have been obtained from the state.

Comparisons.—Comparison of one topotype of dissimilis with topotypes of Thomomys bottae aureus shows it to differ as follows: Size smaller throughout.

Comparisons.—Compared with one topotype and seven near topotypes of Thomomys talpoides pygmaeus, ocius differs as follows: Size larger in every measurement taken.

Possibly it is noteworthy that the specimens from Las Animas are larger than Hooper's holotype and one topotype; this larger size is indicative of intergradation with G. b. lutescens as represented by the specimens examined by us from Pueblo.