Part 8 (1/2)

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 Tacambaro 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 a.n.a.lysis of the geographic variation in _Reithrodontomys megalotis_ and _Reithrodontomys fulvescens_.

As ill.u.s.trative 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.

Table headings: A: Number averaged or catalogue No.

B: s.e.x C: Total length D: Length of tail E: Length of hind foot F: Basilar length G: Length of nasals H: Zygomatic breadth I: Mastoid breadth J: Alveolar length of maxillary tooth-row

========================================================================= LOCALITY A B C D E F G H I J ------------------------------------------------------------------------- Vall. Mex. 3 [M][M] 200 114 22.0 17.6 9.3 12.0 10.7 3.7 Patzcuaro 5 [M][M] 170 101 20.6 16.7 8.7 11.6 10.6 3.7 Zamora 100215 [M] 153 82 19.0 15.9 7.8 10.9 10.3 3.5 Zamora 100275 [M] 184 101 21.0 16.5 8.0 11.1 10.4 3.6 Tacambaro 5 [M][M] 159 91 19.4 15.5 8.0 10.5 9.6 3.3 Vall. Mex. 3 [F][F] 184 103 21.0 16.6 8.7 11.4 10.6 3.6 Patzcuaro 5 [F][F] 182 104 21.6 16.8 8.6 11.6 10.5 3.6 Zamora 5 [F][F] 159 91 19.0 16.0 8.4 11.4 10.0 3.5 Tacambaro 5 [F][F] 149 87 18.6 14.9 7.7 10.4 9.5 3.4 ------------------------------------------------------------------------- Note: [M] = Male and [F] = Female.

=Reithrodontomys fulvescens inexspectatus= Elliot

Fulvous Harvest Mouse; Spanish, Raton Moreno

_Rhithrodontomys inexspectatus_ Elliot, Field Columb. Mus.

zool. ser., 3:145, February, 1903, type from Patzcuaro, Michoacan.

_Reithrodontomys fulvescens toltecus_, Howell, N. Amer. Fauna, 36:51, June 5, 1914, part.

_Range_.--Central Michoacan; limits of range unknown.

_Specimens examined_, 15: nos. 100278-100292, distributed by localities as follows: 3 mi. N Patzcuaro, 6,800 ft., 6; 3 mi. NW Patzcuaro, 6,700 ft., 3; 2 mi. W Patzcuaro, 7,600 ft., 2; 2 mi. W Patzcuaro, 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 Patzcuaro, the upper parts are more reddish than in _R. f. toltecus_ from the valley of Mexico, 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 Patzcuaro is intermediate between _R. f. tenuis_ and _R. f. toltecus_ but nearer the latter.

=Reithrodontomys chrysopsis chrysopsis= Merriam

Volcano Harvest Mouse; Spanish, Raton Dorado

_Reithrodontomys chrysopsis_ Merriam, Proc. Biol. Soc.

Was.h.i.+ngton, 13:152, June 13, 1900, type from Mount Popocatepetl, Mexico.

_Reithrodontomys chrysopsis chrysopsis_, Howell, N. Amer.

Fauna, 36:66, June 5, 1914.

_Range._--Patamban, 1,200 feet elevation as now known.

_Remarks._--Howell (1914:68) lists nine specimens from Patamban. We have not examined these specimens. He listed at the same time seven of the specimens from Tancitaro, but we have found specimens from Tancitaro to be of another subspecies, _R. c. seclusus_. Accordingly, we are in doubt as to whether the mice from Patamban are subspecies _chrysopsis_, _seclusus_, or an unnamed subspecies and our use here of the name _Reithrodontomys chrysopsis chrysopsis_ for them is, of course, provisional.

=Reithrodontomys chrysopsis seclusus= Hall and Villa

Volcano Harvest Mouse; Spanish, Raton Dorado