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..." .........5. P.gymnurus 318 
B. Nasals truncate; hind feet hairy, whitish. 
OMe, DEOMI vy its gs os wo so P. tylorhinus 319 
Dip DO Were SUUVOUS 55 creeks 6 GS oes ad P.t. angustirostris 319 
CeO ve eneseNUt... sso mea ss in ws peeing P. planiceps 319 
Bees nore pee, Cull Chestmey ic. oo... Ss... tae P. neglectus 319 
315. fumosus (Geomys), Merr., Proc. Biol. Soc. Wash., vir, 1892, p. 
TOS: 
Jumosus (Platygeomys), Merr., Mon. Geomyide, N. Am. Faun., 
No: 8, 1895; sp. Tyee 21, fig. 4; pl: 14, nes. 
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 vertebra, 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, 
II.5— op length of single half of mandible, 40.5—46.5. 
316. gymnurus (Geomys), Merr., Proc. Biol. Soc. Wash., vu, 1892, 
p. 166. 
gymnurus (Platygeomys), Merr., Mon. Geomyide, N. Am. Faun., 
No. 8, 1895, p. 164, pls. 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 vertebre, 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, 
I 4.5; length of single half of mandible, 41-45. 
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