142 FIELD COLUMBIAN MUSEUM -ZOOLOGY, VOL. III. 



GENUS PEROMYSCUS. 



Peromyscus. Glog. Handb. & Hilfsb. Natur. , 1842, p. 95. 



Peromyscus 1. sonoriensis. (Le Conte) Proc. Acad. Nat. 

 Scien. Phila., 1853, p. 413. 



Twenty specimens: 19 from Ocotlan, State of Jalisco, and i 

 from Patzcuaro, State of Michoacan. 



These specimens of this widely dispersed species are practi- 

 cally identical with those from Woodford, Alpine County, Cali- 

 fornia, obtained by W. W. Price in 1895. 



Peromyscus *sagax. Sp. nov. 



Five specimens from Patzcuaro, State of Michoacan: two 

 adults, three young. 



Type locality. La Palma, State of Michoacan. 



Gen. cliar. Similar in color to P. difficilis, but cranial char- 

 acters different. Ears large. Skull : brain case nearly square, 

 broad; interorbital constriction considerable. As compared with 

 skull of P. difficilis, that of the present species is shorter and nar- 

 rower with shorter nasals but of about equal width; bullae smaller 

 and closer together and molars much smaller. 



Color. Top of head and dorsal region mixed grayish black 

 and buff, the former predominating; sides grayish brown and buff 

 with an indistinct buff lateral line; orbital ring and spot behind 

 nose black, with a buff spot between it and the eye; sides of head 

 and shoulders buffy gray; sides like thighs; hands and feet white. 

 Tail dusky above, white beneath; ears large, brown at base, 

 blackish at tip with narrow white edges. 



Measurements. Total length, 192; tail vertebrae, 107: hind 

 foot, 22. Skull: total length, 26; Hensel, 20; zygomatic width, 

 33: mastoid width, 12; length of nasals, 10; greatest width of 

 rostrum, 4; palatal length, 4: interorbital constriction, 4; length 

 of incise foramina, 4; length of upper molar series, 4; of lower 

 molar series, 4. 



While resembling the type of P. difficilis in gene/al color 

 without any rufous tinge, the present form has smaller ears and 

 a shorter tail with marked cranial differences as given above. 



Peromyscus -ipavidus. Sp. nov. 



Three specimens from Patzcuaro, State of Michoacan. 



Type locality. Patzcuaro, State of Michoacan, Mexico. 



Gen. cliar. Tail long; ears large; colors pale. Skull with a 

 very broad brain case; mastoid width the greatest; rostrum long 



*>acax. acute, slirewd. 

 rpavidus, timid, fearful. 



