318 PLATYGEOMYS. 



KEY TO SPECIES AND SUBSPECIES. 



A. Nasals wedge-shaped; hind feet nearly naked. PAGE 



a. Above sooty, washed with reddish brown P. fumosus 318 



b. Above chestnut or slate black P. gymnurus 3 1 8 



B. Nasals truncate; hind feet hairy, whitish. 



a. Above liver brown P. tylorhinus 319 



b. Above pale fulvous P.t. angustirostris 319 



c. Above chestnut P. planiceps 319 



d. Above pale, dull chestnut ^. .P. neglectus 319 



315. fumosus (Geomys), Merr., Proc. Biol. Soc. Wash., vn, 1892, p. 

 165. 



fumosus (Platygeomys), Merr., Mon. Geomyidas, N. Am. Faun., 



No. 8, 1895, p. 170, pi. n, fig. 4; pi. 14, fig. 8. 

 SOOTY POCKET GOPHER. 



Type locality. Colima City, State of Colima, Mexico. 



Geogr. Distr. State of Colima, Mexico. 



Genl. Char. Size medium; tail and hind feet nearly naked. 

 Skull: posterior portion of cranium broad; squamosals expanded; 

 zygomata rounded anteriorly, greatest width at median portion; 

 nasals wedge-shaped. 



Color. Above sooty washed with reddish brown ; under parts pale 

 plumbeous washed with light brown. 



Measurements. Total length, 287; tail vertebrae, 82; hind foot, 

 42. Skull: basal length, 49-55.5; Hensel, 44-51; zygomatic width, 

 35.5-39; interorbital width, 8-9.5; length of upper molar series, 

 11.5-13; length of single half of mandible, 40.5-46.5. 



316. gymnurus (Geomys), Merr., Proc. Biol. Soc. Wash., vn, 1892, 

 p. 166. 



gymnurus (Platygeomys) , Merr., Mon. Geomyidae, N. Am. Faun., 



No. 8, 1895, p. 164, pis. and figs. 

 NAKED-TAILED POCKET GOPHER. 



Type locality. Zapotlan, State of Jalisco, Mexico. 



Geogr. Distr. Valley of Zapotlan and slopes of the Sierra Nevada 

 de Colima, State of Jalisco, Mexico. 



Genl. Char. Size large; pad on nose and tail naked; feet nearly 

 hairless. 



Color. Upper parts chestnut, sometimes slate black; under parts 

 paler; young slate black; sides and rump with whitish bristles. 



Measurements. Total length, 352; tail vertebrae, 105; hind foot, 

 53. Skull: basal length, 57-62.5; Hensel, 53-57.5; zygomatic width, 

 42-46.5; interorbital width, 9-10; length of upper molar series, 

 13-14.5; length of single half of mandible, 41-45. 



