OTOTYLOMYS. 221 
both ends; mandible with angle excavated posteriorly, a backward pro- 
jecting point; infracondyloid notch long and deep; coronoid process 
minute; postcoronoid notch flat, nearly horizontal. (ex Merr., 1. c.) 
KEY TO THE SPECIES. 
A. Ears very large; tail long as head and body, 
naked, scaly. 
a. Above grayish or fulvous brown. PAGE 
a.’ Size large; back uniform in color.......... O. phyllotis 221 
b.’ Size smaller; back varying in color........ O. p. pheus 221 
200. phyllotis (Ototylomys), Merr., Proc. Wash. Acad. Scien., I11, 
zge7, Dp. 502. 
TunKas Rat. 
Type locality. Tunkas, Yucatan, Mexico. 
Genl. Char. Similar to Tylomys in appearance; characters those 
of the genus. 
Color. Above grayish or fulvous brown, sometimes mixed with 
black-tipped hairs; under parts and inner sides of legs white; cheeks 
and about eyes fulvous; tail above brownish dusky, beneath yellowish; 
hands and feet whitish; wrists and ankles dark; ears flesh color at 
base, rest black. 
Measurements. Total length, 303; tail, 148; hind foot, 28. 
(ex Type.) Skull: occipito-nasal length, 39; Hensel, 31.8; zygomatic 
width, 24.3; interorbital constriction, 5.6; length of nasals, 14; 
palatal length, 15.6; length of upper molar series, 5.3; length of 
mandible, angle to alveolus of incisor, 18.6. 
a.—pheus (Ototylomys), Merr., Proc. Wash. Acad. Scien., UI, 1907, 
p- 563. 
APAZOTE Rar. 
Type locality. Apazote,near Yohaltun, State of Campeche, Mexico. 
Genl. Char. Similar to O. phyllotis, but smaller; tail shorter; 
colors darker. 
Color. Above dark grayish brown, mixed with black, hinder 
part of dorsal region dusky; anterior part of back and sides grayish 
brown, tinged with fulvous; arms white; legs grayish brown; hands 
and feet white; tail dark brown above, yellow beneath; ears flesh 
color at base, rest black. 
Measurements. Total length, 266; tail, 136; hind foot, 26.5. 
(ex Type.) 
The Genus Ho.ocuitus introduced here by Miller and Rehn, 
Syst. Res. N. Am. Mamm., 1902, p. 89, to follow TyLomys, has no 
species north of the Isthmus of Panama, and H. pilorides, Pallas, is 
a native of the island of Ceylon. 
