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. hy locates (Pcromyscus), Merr., Proc. Biol. Soc. Wash., xn, 



1898, p. 124. 

 DRYAD 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 vertebrae, 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 vertebrae, 114; hind foot, 

 28. (ex Type.) 



176a. lophurus (Peromyscus), Osgood, Proc. Biol. Soc. Wash., xvn, 



1904, p. 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 

 vertebras, 105; hind foot, 24.5. Skull: greatest length, 27.5; Hensel, 

 20.8; zygomatic width, 14.7; interorbital constriction, 4.3; inter- 

 parietal, 10X4.5; length of nasals, 10; palate, 4; postpalatal length, 

 9.6; length of upper molar series, 4.7. 



