Part 11

Remarks.--Burrows were common in cultivated fields and along the roads and trails on the southern and southeastern side of Lake PAitzcuaro. In the vicinity of TacAimbaro 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 PAitzcuaro are: , 683 (562-819); , 558 (438-707) grams.

=Cratogeomys angustirostris= (Merriam)

Plains Pocket Gopher; Spanish, Tuza Llanera; Tarascan, Cumo (Como)

Platygeomys tylorhinus angustirostris Merriam, Proc. Biol. Soc. Washington, 16:81, May 29, 1903, type from PatambAin, 10,000 ft., MichoacAin.

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, Cumu (Como)

Platygeomys varius Goldman, Jour. Mamm., 20:90, February 14, 1939, type from Uruapan, about 6,000 ft., MichoacAin.

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

MichoacAin Pocket Gopher; Spanish, Tuza de MichoacAin; Tarascan, Cumu (Como)

Zygogeomys trichopus tarascensis Goldman, Proc. Biol. Soc. Washington, 51:211, December 23, 1938, type from six miles southeast of PAitzcuaro, 8,000 ft., MichoacAin.

Zygogeomys trichopus Merriam, N. Amer. Fauna, 8:196, January 31, 1895.

Range.--"Known only from the upper slopes of the mountains in the vicinity of the type locality" (Goldman, 1938:211).

Remarks.--As we drove an automobile from PAitzcuaro to TacAimbaro we noted mounds made by pocket gophers along the road in the highest part of the pass and supposed that these mounds were made by Zygogeomys although we took no specimens of any kind of pocket gopher in the pass.

=Zygogeomys trichopus trichopus= Merriam

MichoacAin Pocket Gopher; Spanish, Tuza de MichoacAin; Tarascan, Cumu (Como)

Zygogeomys trichopus Merriam, N. Amer. Fauna, 8:196, pl. 6, 14-18, January 31, 1895, type from Nahuatzin, MichoacAin.

Range.--Altitudinally from 6,000 feet to 11,800 feet on Mountains TancA-taro, PatambAin, and at Nahuatzin.

Specimens examined, 9: nos. 51970-51978, all from Mount TancA-taro, distributed by altitude as follows: 6,000 ft., 5; 7,800 ft., 3; 10,500 ft., 1.

Remarks.--The upper parts of specimens available to us are rich Seal-Brown and glossy. The chin, and in most specimens, the upper side of the hind feet are white; the irregular white patch of the throat is present only in two young females, numbers 51974 and 51978.

=Liomys pictus plantinarensis= Merriam

Western Spiny Pocket Mouse; Spanish, RatA cubedn Espinoso Occidental; Tarascan word for mouse is JeyAiqui (Hayake)

Liomys plantinarensis Merriam, Proc. Biol. Soc. Washington, 15:46, March 5, 1902, type from Plantinar, Jalisco.

Liomys pictus plantinarensis, Goldman, N. Amer. Fauna, 34:37, September 7, 1911.