Peromyscus perfulvus Osgood
Marsh Mouse; Spanish, Ratón Breñero
Peromyscus perfulvus Osgood, Jour. Mamm., 26:299, November 14, 1945, type from 10 kilometers west of Apatzingan, 1,040 ft., Michoacán.
Range.—Known only from the semitropical Life-zone in western Michoacán.
Specimens examined, 5: nos. 100593, 100595, 100597, 100598, and 100600, all from 1 mi. E and 6 mi. S Tacámbaro, 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, Ratón 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: 1½ mi. SSE Tacámbaro, 5,700 ft., 16; 1¾ mi S Tacámbaro, 5,700 ft., 1; 1 mi. E and 2½ mi. S Tacámbaro, 4,700 ft., 5.