1894. _Dipodomys merriami atronasus_ Merriam, Proc. Biol.
Soc. Washington, 9:113, June 21, type from Hacienda La
Parada, about 25 mi. NW San Luis Potosi, San Luis Potosi.
_Distribution in Tamaulipas._--Mexican Plateau in western
part of state.
Specimens examined are tentatively assigned to _Dipodomys merriami
atronasus_. They differ from typical _atronasus_ as pointed out by
Lidicker (1960:177). He noted that individuals from the eastern edge of
the range of _D. m. atronasus_ were slightly paler than typical
specimens, but I found Tamaulipan material to be much darker,
especially behind the nose and ears (blackish instead of brownish),
than specimens from Aguascalientes, San Luis Potosi and Zacatecas.
Specimens examined were collected under the same conditions and in the
same areas as _D. ordii durranti_. The average weight of 20 adults (11
females and nine males) was 46.6 (38-50) grams.
_Records of occurrences._--Specimens examined, 27: Nicolas,
56 km. NW Tula, 5500 ft., 16; Tajada, 23 mi. NW Tula, 5200
ft., 4; 15 mi. N Tula, 1; 8 mi. N Tula, 4500 ft., 3; 9 mi.
SW Tula, 3900 ft., 3.
Additional record: Tula (Lidicker, 1960:178).
=Liomys irroratus=