Range.—From northwestern part of state south through its central part.
Specimens examined, 53: nos. 100217-100269; distributed by localities, with reference to Pátzcuaro, as follows: 3 mi. N, 6,700 ft., 3; 3 mi. N, 6,800 ft., 1; 3½ mi. S, 7,900 ft., 3; 4 mi. S, 7,800 ft., 31; 5 mi. S, 7,800 ft., 9; 9 mi. SE, 8,000 ft., 6.
Remarks.—Howell (1914:40) has referred four specimens from Patambán to this subspecies, and our large series from the vicinity of Pátzcuaro is also referred to R. m. zacatecae because of small size and reddish (less blackish) color. We lack typical specimens of R. m. zacatecae from the type locality for comparison and our knowledge of zacatecae is derived from Howell's (1914:39) description of it.
Average measurements of 5 adult males of R. m. zacatecae from the Pátzcuaro area showing much wear on the teeth compared with those of five specimens from the Zamora area, of corresponding sex and age of R. m. saturatus reveal the smaller size of R. m. zacatecae. Total length, 157, 166; length of tail, 84, 84; length of hind foot, 19.6, 20.1; length of ear from notch in flesh, 14.8, 14.0; basilar length, 16.2, 16.6; length of nasals, 8.3, 8.5; zygomatic breadth, 11.1, 11.5; mastoid breadth, 9.9, 10.2; breadth of rostrum, 3.8, 4.0; interorbital construction, 3.2, 3.1; alveolar length of maxillary tooth-row, 3.5, 3.5; length of rostrum, 7.7, 8.0.
Reithrodontomys fulvescens tenuis Allen
Fulvous Harvest Mouse; Spanish, Ratón Moreno
Reithrodontomys tenuis Allen, Bull. Amer. Mus. Nat. Hist., 12:15, March 4, 1899, type from Rosario, Sinaloa.
Reithrodontomys fulvescens tenuis, Howell, N. Amer. Fauna, 36:45, June 5, 1914.
Range.—Western part of state.
Specimens examined, 27: nos. 100213-100216, 100274-100277, 100293-100311, distributed by localities as follows: 11 mi. W Zamora, 5,750 ft., 2; 6½ mi. W Zamora, 5,950 ft., 2; 6 mi. W Zamora, 5,950 ft., 4; 1½ mi. SSE Tacámbaro, 5,700 ft., 2; 1¾ mi. S Tacámbaro, 5,700 ft., 1; 1 mi. E and 2½ mi. S Tacámbaro, 7; 4 mi. S and 1 mi. E Tacámbaro, 4,700 ft., 5; 1 mi. E and 5 mi. S Tacámbaro, 4,000 ft., 1; 1 mi. E and 6 mi. S Tacámbaro, 4,000 ft., 3.
Remarks.—Of the 19 specimens from the vicinity of Tacámbaro, only two have the underparts reddish as does R. f. inexspectatus. The upper parts are less reddish than in R. f. inexspectatus but more reddish and less blackish than in R. f. toltecus from the valley of México or than in R. f. toltecus from Zamora. The external measurements and cranial measurements are less than in R. f. toltecus or R. f. inexspectatus and are as small as, or even smaller than, those of R. f. tenuis to the northward or than those of R. f. nelsoni to the westward. Relying only on printed descriptions of R. f. tenuis and R. f. nelsoni, we are inclined to refer our specimens to R. f. tenuis although the reddish color, we suppose, is evidence of intergradation with R. f. nelsoni and R. f. inexspectatus.