_Reithrodontomys megalotis zacatecae_ Merriam, Proc.
Washington Acad. Sci., 3:557, November 29, 1901, type from
Valparaiso Mountains, Zacatecas.
_Range._--From northwestern part of state south through its central
part.
_Specimens examined_, 53: nos. 100217-100269; distributed by
localities, with reference to PAitzcuaro, as follows: 3 mi. N,
6,700 ft., 3; 3 mi. N, 6,800 ft., 1; 3-1/2 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 PatambAin
to this subspecies, and our large series from the vicinity of
PAitzcuaro 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
PAitzcuaro 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