204 PEROMYSCUS. 
28; ear, 26. Skull: occipito-nasal length, 29; Hensel, 22; zygomatic 
width, 15; interorbital constriction, 4; width of braincase, 13.2; 
length of nasals, 10; palatal length, 12. 
175. hylocetes (Peromyscus), Merr., Proc. Biol. Soc. Wash., xu, 
1898, p. 124. 
Dryap Mouse. 
Type locality. Patzcuaro, State of Michoacan, Mexico. Altitude 
8,000 feet. 
Geogr. Distr. State of Michoacan, Mexico; range unknown. 
Genl. Char. Tail shorter than head and body; size large. 
Color. Above buffy gray, darkest on dorsal region; sides buffy 
ochraceous; under parts, lips, and hands whitish; basal part of hind 
foot, wrists, and ankles dusky; tail above dusky, below white. 
Measurements. Total length, 238; tail vertebrez, 114; hind foot, 25. 
176. lepturus (Peromyscus), Merr., Proc. Biol. Soc. Wash., 1898, p. 118. 
Mount ZEMPOALTEPEC FIELD MOUSE. 
Type locality. Mount Zempoaltepec, State of Oaxaca, Mexico. 
Altitude, 8,200 feet. 
Geogr. Distr. State of Oaxaca, Mexico, range unknown. 
Genl. Char. Size large; tail long as head and body, nearly hair- 
less; molars large. 
Color. Above brownish, dorsal area dusky, almost black; cheeks 
and sides brownish fulvous; orbital ring dusky; under parts white; 
tail above dusky, paler beneath; hands whitish; wrists, ankles, and 
hind feet dusky. 
Measurements. Total length, 238; tail vertebre, 114; hind foot, 
28. (ex Type.) 
176a. lophurus (Peromyscus), Osgood, Proc. Biol. Soc. Wash., Xvi, 
L004. 72: 
CRESTED-TAILED MOUSE. 
Type locality. Todos Santos, Guatemala. 
Genl. Char. Similar to P. lepturus, but smaller and paler; tail 
long, hairy, penicillate. 
Color. Upper parts between wood brown and fawn; middle of 
back dusky; lateral line pale ochraceous buff; under parts white; 
orbital ring dusky; tail sepia brown, unicolor; hands white; forearm 
dusky; feet dusky brownish to base of toes, the latter white. 
Measurements. Average of four adults. Total length, 208; tail 
vertebre, 105; hind foot, 24.5. Skull: greatest length, 27.5; Hensel, 
20.8; zygomatic width, 14.7; interorbital constriction, 4.3; inter- 
parietal, toX 4.5; length of nasals, 10; palate, 4; postpalatal length, 
9.6; length of upper molar series, 4.7. 
