The four skins from Zamora are gray, as opposed to reddish, both above and below and in this respect they agree with the description of R. f. tenuis. They are lighter-colored (grayer) than either R. f. toltecus or R. f. inexspectatus. The four specimens from Zamora are larger than animals from the vicinity of Tacámbaro and average slightly smaller than topotypes of R. f. inexspectatus.
By identifying our specimens as R. f. inexspectatus and R. f. tenuis, we are left without any specimens that we, ourselves, have examined, which are referable to the subspecies R. f. toltecus. The specimens from Los Reyes which Howell (1914:47) referred to R. f. toltecus have not been seen by us, and we guess, on the criteria used by us, that the animals would be referable to R. f. tenuis. Because Dr. Emmet T. Hooper has a revisionary study of the Mexican Reithrodontomys underway, we have not attempted to bring together all of the pertinent material from different collections as would be required for an ideally thorough analysis of the geographic variation in Reithrodontomys megalotis and Reithrodontomys fulvescens.
As illustrative of statements made concerning the average size of Reithrodontomys fulvescens, the following measurements, all of specimens with much wear on each of the molar teeth, are recorded.
| Locality | Number averaged or catalogue No. | Sex | Total length | Length of tail | Length of hind foot | Basilar length | Length of nasals | Zygomatic breadth | Mastoid breadth | Alveolar length of maxillary tooth-row |
| Vall. Mex. | 3 | ♂♂ | 200 | 114 | 22.0 | 17.6 | 9.3 | 12.0 | 10.7 | 3.7 |
| Pátzcuaro | 5 | ♂♂ | 170 | 101 | 20.6 | 16.7 | 8.7 | 11.6 | 10.6 | 3.7 |
| Zamora | 100215 | ♂ | 153 | 82 | 19.0 | 15.9 | 7.8 | 10.9 | 10.3 | 3.5 |
| Zamora | 100275 | ♂ | 184 | 101 | 21.0 | 16.5 | 8.0 | 11.1 | 10.4 | 3.6 |
| Tacámbaro | 5 | ♂♂ | 159 | 91 | 19.4 | 15.5 | 8.0 | 10.5 | 9.6 | 3.3 |
| Vall. Mex. | 3 | ♀♀ | 184 | 103 | 21.0 | 16.6 | 8.7 | 11.4 | 10.6 | 3.6 |
| Pátzcuaro | 5 | ♀♀ | 182 | 104 | 21.6 | 16.8 | 8.6 | 11.6 | 10.5 | 3.6 |
| Zamora | 5 | ♀♀ | 159 | 91 | 19.0 | 16.0 | 8.4 | 11.4 | 10.0 | 3.5 |
| Tacámbaro | 5 | ♀♀ | 149 | 87 | 18.6 | 14.9 | 7.7 | 10.4 | 9.5 | 3.4 |
Reithrodontomys fulvescens inexspectatus Elliot
Fulvous Harvest Mouse; Spanish, Ratón Moreno
Rhithrodontomys inexspectatus Elliot, Field Columb. Mus. zoöl. ser., 3:145, February, 1903, type from Pátzcuaro, Michoacán.
Reithrodontomys fulvescens toltecus, Howell, N. Amer. Fauna, 36:51, June 5, 1914, part.
Range.—Central Michoacán; limits of range unknown.
Specimens examined, 15: nos. 100278-100292, distributed by localities as follows: 3 mi. N Pátzcuaro, 6,800 ft., 6; 3 mi. NW Pátzcuaro, 6,700 ft., 3; 2 mi. W Pátzcuaro, 7,600 ft., 2; 2 mi. W Pátzcuaro, 7,700 ft., 4.
Remarks.—Howell (1914:51) made R. inexspectatus Elliot a synonym of R. f. toltecus and perhaps we should follow him in this. The facts are that in our large series from the vicinity of Pátzcuaro, the upper parts are more reddish than in R. f. toltecus from the valley of México, and more reddish than in R. f. tenuis if we correctly interpret Howell's (op. cit.,:45) description of R. f. tenuis. In the color of the underparts the series is, to us, indistinguishable from topotypical toltecus and therefore has more reddish underparts than R. f. tenuis, as we know R. f. tenuis, from Howell's (loc. cit.) description. In size, the series from Pátzcuaro is intermediate between R. f. tenuis and R. f. toltecus but nearer the latter.