Baiomys musculus, Mearns, U. S. Nat. Mus. Bull., 56:381, April 13, 1907.
Range.—Dry, tropical, southwestern parts of state.
Specimens examined, 41: nos. 100366-100406; distributed by localities as follows: 1¾ mi. S Tacámbaro, 5,700 ft., 1; 1 mi. E and 2½ mi. S Tacámbaro, 4,700 ft., 11; 4 mi. S and 1 mi. E Tacámbaro, 10; 1 mi. E and 5 mi. S Tacámbaro, 4,000 ft., 1; 6 mi. S Tacámbaro, 4,000 ft., 4; 1 mi. E and 6 mi. S Tacámbaro, 4,000 ft., 14.
Remarks.—Osgood (1909:258) has recorded this subspecies also from La Huacana and La Salada. Three adult males with much worn teeth weigh, in grams, 8.3, 9.3, and 10.8. Weights of three adult, nonpregnant, females are 8.1, 9.4, and 9.7. None of our 13 females was pregnant.
Peromyscus maniculatus labecula Elliot
Deermouse; Spanish, Ratón Cuatralvo
Peromyscus labecula Elliot, Field Columb. Mus., zoöl. ser., 3:143, February (March?), 1903, type from Ocotlan, Jalisco.
P[eromyscus]. s[onoriensis]. labecula, Osgood, Proc. Biol. Soc. Washington, 17:57, March 21, 1904.
Range.—Northwestern part of state.
Specimens examined, 59: nos. 51402-51406, 52175, 52176, 100407-100447, 100484; and 1366-1368, 1370-1372, 1374-1377, of Bernardo Villa R., distributed by localities as follows: Tancítaro, 7; 11 mi. W Zamora, 5,750 ft., 3; 2 mi. W Pátzcuaro, 7,700 ft., 4; 3½ mi. S Pátzcuaro, 7,800 ft., 2; 4 mi. S Pátzcuaro, 7,800 ft., 3; 5 mi. S Pátzcuaro, 7,800 ft., 24; 9 mi. SE Pátzcuaro, 8,000 ft., 6; 1½ km. N San Juan, 2,250 M., 3; 1 km. NNE San Juan, 2,250 M., 7.
Remarks.—The zygomatic arches are less widely flaring in specimens from Tancítaro than in those from Pátzcuaro.