Part 6 (1/2)

Plains Pocket Gopher; Spanish, Tuza Llanera; Tarascan, c.u.mu (Como)

_Platygeomys gymnurus imparilis_, Goldman, Jour. Mamm., 20:89, February 14, 1939, type from Patzcuaro, 7,000 ft., Michoacan.

_Platygeomys tylorhinus_ Merriam, N. Amer. Fauna, 8:167, pl.

13, fig. 1, January 31, 1895.

_Range._--Patzcuaro and Tacambaro, as now known.

_Specimens examined_, 14: nos. 100153-100166, distributed by localities as follows: 2 mi. W Patzcuaro, 7,700 ft., 2; 3 mi. S Patzcuaro, 7,800 ft., 1; 4 mi. S Patzcuaro, 7,800 ft., 1; 5 mi. S.

Patzcuaro, 7,800 ft., 6; 9 mi. SE Patzcuaro, 8,000 ft., 1; 1-3/4 mi. S Tacambaro, 5,700 ft., 1; 1-1/2 mi. S Tacambaro, 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 Patzcuaro. In the vicinity of Tacambaro 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 _Th.o.m.omys 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 s.e.x from 2 to 5 miles south of Patzcuaro are: [M], 683 (562-819); [F], 558 (438-707) grams.

=Cratogeomys angustirostris= (Merriam)

Plains Pocket Gopher; Spanish, Tuza Llanera; Tarascan, c.u.mu (Como)

_Platygeomys tylorhinus angustirostris_ Merriam, Proc. Biol.

Soc. Was.h.i.+ngton, 16:81, May 29, 1903, type from Patamban, 10,000 ft., Michoacan.

_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, c.u.mu (Como)

_Platygeomys varius_ Goldman, Jour. Mamm., 20:90, February 14, 1939, type from Uruapan, about 6,000 ft., Michoacan.

_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

Michoacan Pocket Gopher; Spanish, Tuza de Michoacan; Tarascan, c.u.mu (Como)

_Zygogeomys trichopus tarascensis_ Goldman, Proc. Biol. Soc.

Was.h.i.+ngton, 51:211, December 23, 1938, type from six miles southeast of Patzcuaro, 8,000 ft., Michoacan.

_Zygogeomys trichopus_ Merriam, N. Amer. Fauna, 8:196, January 31, 1895.