_Platygeomys gymnurus imparilis_, Goldman, Jour. Mamm., 20:89, February 14, 1939, type from Pátzcuaro, 7,000 ft., Michoacán. _Platygeomys tylorhinus_ Merriam, N. Amer. Fauna, 8:167, pl. 13, fig. 1, January 31, 1895. _Range._--Pátzcuaro and Tacámbaro, as now known. _Specimens examined_, 14: nos. 100153-100166, distributed by localities as follows: 2 mi. W Pátzcuaro, 7,700 ft., 2; 3 mi. S Pátzcuaro, 7,800 ft., 1; 4 mi. S Pátzcuaro, 7,800 ft., 1; 5 mi. S. Pátzcuaro, 7,800 ft., 6; 9 mi. SE Pátzcuaro, 8,000 ft., 1; 1-3/4 mi. S Tacámbaro, 5,700 ft., 1; 1-1/2 mi. S Tacámbaro, 5,700 ft., 2. _Remarks._--Burrows were common in cultivated fields and along the roads and trails on the southern and southeastern side of Lake Pátzcuaro. In the vicinity of Tacámbaro we noted burrows only in the area between one and a half and two miles south of town where two specimens were taken. As mentioned in the immediately preceding account, the small _Thomomys umbrinus pullus_ and the large _Cratogeomys_ were found in the same area. The color of our specimens varies from Cinnamon-Brown through Prouts Brown and in some specimens is Fuscous Black. Hooper (1946:397) has shown that the genus _Platygeomys_ is not generically distinct from the earlier named _Cratogeomys_. From independent study of specimens not examined by Hooper we have satisfied ourselves that he is correct in synonymizing _Platygeomys_ under _Cratogeomys_. Average and extreme weights of 4 of each sex from 2 to 5 miles south of Pátzcuaro are: [M], 683 (562-819); [F], 558 (438-707) grams. =Cratogeomys angustirostris= (Merriam) Plains Pocket Gopher; Spanish, Tuza Llanera; Tarascan, Cúmu (Cŏmŏ) _Platygeomys tylorhinus angustirostris_ Merriam, Proc. Biol. Soc. Washington, 16:81, May 29, 1903, type from Patambán, 10,000 ft., Michoacán. _Platygeomys angustirostris_, Goldman, Jour. Mamm., 20:90, February 14, 1939. _Range._--Known only from the type locality. =Cratogeomys varius= (Goldman) Plains Pocket Gopher; Spanish, Tuza Llanera; Tarascan, Cúmu (Cŏmŏ) _Platygeomys varius_ Goldman, Jour. Mamm., 20:90, February 14, 1939, type from Uruapan, about 6,000 ft., Michoacán. _Range._--Known only from the type locality. _Remarks._--Specimens from localities intermediate between Uruapan, the type locality of _C. varius_, and the known localities of occurence of _Cratogeomys gynmurus imparilis_ are much needed to ascertain if _C. varius_ is specifically different from _C. g. imparilis_, or merely subspecifically different. =Zygogeomys trichopus tarascensis= Goldman Michoacán Pocket Gopher; Spanish, Tuza de Michoacán; Tarascan, Cúmu (Cŏmŏ) _Zygogeomys trichopus tarascensis_ Goldman, Proc. Biol. Soc. Washington, 51:211, December 23, 1938, type from six miles southeast of Pátzcuaro, 8,000 ft., Michoacán. _Zygogeomys trichopus_ Merriam, N. Amer. Fauna, 8:196, January 31, 1895.