Part 15

Remarks.--Osgood (1909:257) has recorded this subspecies also from AcAimbaro and Los Reyes. We found that these animals got caught in our traps almost as often in the daytime as at night and concluded that they were less nocturnal, or at any rate more diurnal, than any of the other cricetine mice at the places in MichoacAin where we trapped.

=Baiomys musculus musculus= (Merriam)

Tropical Pygmy Mouse; Spanish, RatA cubedn Pigmeo Tropical

Sitomys musculus Merriam, Proc. Biol. Soc. Washington, 7:170, September 29, 1892, type from Colima, Colima.

Peromyscus musculus, Allen and Chapman, Bull. Amer. Mus. Nat. Hist., 9:203, June 16, 1897.

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: 1-3/4 mi. S TacAimbaro, 5,700 ft., 1; 1 mi. E and 2-1/2 mi. S TacAimbaro, 4,700 ft., 11; 4 mi. S and 1 mi. E TacAimbaro, 10; 1 mi. E and 5 mi. S TacAimbaro, 4,000 ft., 1; 6 mi. S TacAimbaro, 4,000 ft., 4; 1 mi. E and 6 mi. S TacAimbaro, 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, RatA cubedn Cuatralvo

Peromyscus labecula Elliot, Field Columb. Mus., zoAśl. 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: TancA-taro, 7; 11 mi. W Zamora, 5,750 ft., 3; 2 mi. W PAitzcuaro, 7,700 ft., 4; 3-1/2 mi. S PAitzcuaro, 7,800 ft., 2; 4 mi. S PAitzcuaro, 7,800 ft., 3; 5 mi. S PAitzcuaro, 7,800 ft., 24; 9 mi. SE PAitzcuaro, 8,000 ft., 6; 1-1/2 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 TancA-taro than in those from PAitzcuaro.

=Peromyscus perfulvus= Osgood

Marsh Mouse; Spanish, RatA cubedn BreA+-ero

Peromyscus perfulvus Osgood, Jour. Mamm., 26:299, November 14, 1945, type from 10 kilometers west of Apatzingan, 1,040 ft., MichoacAin.

Range.--Known only from the semitropical Life-zone in western MichoacAin.

Specimens examined, 5: nos. 100593, 100595, 100597, 100598, and 100600, all from 1 mi. E and 6 mi. S TacAimbaro, 4,000 ft.

Remarks.--J. R. Alcorn took these specimens between fields of sugar cane in tall (5 ft. high) grass growing in a belt 10 feet or so wide along side a stream, which a person could step across. The one adult, no. 100597, was recognized at the time of capture as different from any other species known to us, by reason of the long, unicolored, sparsely-haired tail and nearly clear Cinnamon Rufous color above, white underparts, white feet, and dark brown ears. The four other specimens in darker immature pelage are plumbeous and cinnamon whereas immature individuals of comparable age of Peromyscus banderanus caught in the same place are plumbeous above and lack the cinnamon color. The immature animals of the two species differ in color more than do the adults. Osgood (1945:300) has recorded eleven specimens from the type locality. Our one adult weighs 52.4 grams.

=Peromyscus boylii evides= Osgood

Brush Mouse; Spanish, RatA cubedn de Chaparral

Peromyscus spicilegus evides Osgood, Proc. Biol. Soc. Washington, 17:64, March 21, 1904, type from Juquila, Oaxaca.

Peromyscus boylei evides Osgood, N. Amer. Fauna, 28:152, April 17, 1909.

Range.--Northern part of state.

Specimens examined, 22: nos. 100450-100471, distributed by localities as follows: 1-1/2 mi. SSE TacAimbaro, 5,700 ft., 16; 1-3/4 mi S TacAimbaro, 5,700 ft., 1; 1 mi. E and 2-1/2 mi. S TacAimbaro, 4,700 ft., 5.