August 31, 1945)
named _Thomomys bottae jojobae_ from Sangre de Cristo, Baja California,
Mexico, he made no mention of a specimen that Bailey (N. Amer. Fauna,
39:58, November 15, 1915) identified as _Thomomys bottae nigricans_ from
La Huerta, which place is approximately eight miles northwest of Sangre
de Cristo. From a geographic standpoint, it seemed unlikely that the
specimen from La Huerta would be referable to _T. b. nigricans_.
Examination of the specimen (138752 BS) proves it to differ from
topotypes of _T. b. nigricans_ and to agree with _T. b. jojobae_ in
richer, more rufescent color, especially ventrally, and smaller,
slenderer, more delicate skull. The specimen is therefore tentatively
referred to _Thomomys bottae jojobae_. We have not, however, compared it
with specimens of _Thomomys bottae juarezensis_, a subspecies the range
of which lies to the east on the summit of the Sierra Juarez.

~Thomomys bottae martirensis~ J. A. Allen

Bailey (N. Amer. Fauna, 39:58, November 15, 1915) referred pocket
gophers from Pinon on the west slope of the San Pedro Martir Mountains,
Baja California, to the subspecies _Thomomys bottae nigricans_. The
subspecific identity of these animals has now been reinvestigated
subsequently, although the locality whence they were obtained is far
removed from what is now thought to be the geographic range of _T. b.
nigricans_; further, several other subspecies are known to occur in the
intervening area. We have examined the available material from Pinon
(13853-13855 BS) and find the specimens to agree with _Thomomys bottae
martirensis_ and to differ from _T. b. nigricans_ in lighter color,
larger, more ridged and angular skull; proportionately greater mastoidal
breadth; narrower occipital shelf; more ventrally produced alveolar
ramus of the maxillae; and deeply concave posterior border of the
temporal root of the zygomatic arch. These specimens thus constitute the
northernmost record of _T. b. martirensis_ known to us.

~Thomomys bottae mohavensis~ Grinnell

Bailey (N. Amer. Fauna, 39:73, November 15, 1915) assigned a series of 7
specimens from Lone Willow Spring, California, to the subspecies
_Thomomys bottae perpes_. This locality lies at the northern edge of the
Mohave Desert. Later, Grinnell (Univ. California Publ. Zool., 17:427,
April 25, 1918) named the pocket gophers from approximately the eastern
half of the Mohave Desert, _Thomomys perpallidus_ [= _bottae_]
_mohavensis_,