Remarks.—All of the specimens were taken in pine forest. The old male from nine miles southeast of Pátzcuaro weighs 43.7 grams and the younger male from there 35 grams. The adults from Tancítaro have longer diastemae and some have the braincase more prolonged posteriorly, than in specimens from the vicinities of San Juan and Pátzcuaro but individual variation is considerable and we are unable to differentiate some of the adults from Tancítaro from those from elsewhere.
Peromyscus truei gratus Merriam
Piñon Mouse; Spanish, Ratón Piñonero
Peromyscus gratus Merriam, Proc. Biol. Soc. Washington, 12:123, April 30, 1898, type from "Tlalpam," D. F.
Peromyscus sagax Elliot, Field Columb. Mus., Chicago, zoöl. ser., 3:142, February, 1903, type from La Palma, Michoacán.
Peromyscus pavidus Elliot, Field Columb. Mus., Chicago, zoöl. ser., 3:142, February, 1903, type from Pátzcuaro, Michoacán.
Peromyscus zelotes Osgood, Proc. Biol. Soc. Washington, 17:67, March 21, 1904, type from Queréndaro, Michoacán.
Peromyscus truei gratus, Osgood, N. Amer. Fauna, 28:173, April 17, 1909.
Range.—Northern part of state.
Specimens examined, 42: nos. 100448, 100473-100483, 100485-100509, 8700, 8702, 8703, 8896, 8897, distributed by localities as follows: 8 mi. N Zamora, 5,500 ft., 2; 11 mi. W Zamora, 5,750 ft., 11; 6½ mi. W Zamora, 5,950 ft., 4; 6 mi. W Zamora, 5,950 ft., 4; Rio Duaro, 9 mi. E Zamora, 5,500 ft., 1; 3 mi. N Pátzcuaro, 6,800 ft., 1; 3 mi. NW Pátzcuaro, 6,700 ft., 10; 1½ mi. NW Pátzcuaro, 6,700 ft., 1; 2 mi. W Pátzcuaro, 6,700 ft., 3; Pátzcuaro (Chicago Nat. Hist. Mus.), 5.