502 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 92 
SPILOGALE PEDROENSIS, new species 
Figures 42, 438. 
Holotype—Right ramus of mandible, U.S.N.M. No. 14682, including 
the canine, P, and M,. 
Paratype —Left maxillary portion, U. S. N. M. No. 12869, with 
P* and M. 
Locality —Gidley’s rodent locality, about 2 miles northeast by east 
of Curtis ranch house, San Pedro Valley, Ariz. 
Horizon.—Curtis ranch, early Pleistocene. 
Specific characters.—Size near Spilogale ambigua. P* and M* with 
lingual portions not greatly expanded anteroposteriorly. Mandible 
with symphyseal portion projecting markedly downward and lower 
margin of ramus irregular. Lower canine robust. Anterior style 
and posterior transverse crest on P, not well developed. M, slender, 
particularly across protoconid and metaconid, and talonid basin well 
open lingually. 
Figure 42.— Spuilogale ’ Ficure 43.—Spilogale pedroensis, new spe- 
pedroensis, new species: cies: Right ramus of mandible (U.S.N.M. 
Left maxillary portion No 14682), type specimen, lateral and 
with P4 and M! (U.S. occlusal views. 2. Curtis ranch 
N.M. No. 12869), lat- Pleistocene, Arizona. 
eral and occlusal views. 
<2.) Curtis: ranch 
Pleistocene, Arizona. 
Description —The lower jaw (type) of Spilogale pedroensis (fig. 43) 
is about the size of that in male individuals of Spilogale gracilis or 
Spilogale ambigua now living in Arizona,” being distinctly smaller 
than that in Spilogale arizonae. The horizontal ramus of No. 14682 
is distinctive in exhibiting so irregular a lower margin. The sym- 
physeal portion extends markedly downward, and posterior to this 
the lower margin or profile of the jaw is concave as far as the promi- 
nent convexity or angulation directly below the alveolus for M,. A 
second jaw portion, No. 14683, of Spilogale pedroensis with somewhat 
smaller teeth, probably a female, does not show so marked an angula- 
2A. H. Howell, Revision of the skunks of the genus Spilogale. North Amer. Fauna 26, 
pp. 1-55, 10 pls., 1906. 
