144 FIELD COLUMBIAN MUSKUM ZOOLOGY, VOL. III. 



North American mice by the rather conspicuous white spot 

 behind the ears. Only six specimens were procured, all of 

 which were unfortunately injured by cats. 



Peromyscus m. brunneus. Allen & Chapman, Hull. Am. Mus. 

 Nat. Hist., 1902, p. 203. 

 One specimen from Patzcuaro, State of Michoacan. 



GENUS SIGMODON. 



Sigmodon. Say & Ord., Journ. Acad. Nat. Scien. Phil., 1825, p. 352. 

 Sigmodon hispidus ""inexoratus. Subsp. nov. 



Sixteen specimens from Ocotlan, State of Jalisco, Mexico. 



Type locality. Ocotlan, State of Jalisco, Mexico. 



Gen. char. Size large. Similar to .S. hispidus, back grayer 

 above and paler on sides. Infraorbital foramen oblong and nar- 

 row. Skull broad in front. 



Color. Above creamy buff heavily lined with black: sides 

 cream buff; arms, hands and thighs cream buff: hind feet gray; 

 under parts grayish white; tail sparsely haired, blackish above, 

 whitish beneath; ears dark brown. 



Measurements. Total length, 310: tail vertebra, 146; hind 

 foot, 36; Skull: total length, 37; Hensel, 31; zygomatic width, 

 20; mastoid width, 15: median palatal length, 8: length of incisive 

 foramen, 7; upper tooth row. 7: lower tooth row, 7. 



These specimens do not seem to agree with any described 

 forms. In size they are about equal to the large major and 

 tona/cnsis, but are otherwise quite different, and while approach- 

 ing mascotcnsis in cranial characters, they are much larger and of 

 a different color. 



Sigmodon mascotensis. Allen, Bull. Am. Mus. Nat. Hist., 1897, 



P-54- 



One specimen. 



This species of cotton rat has a coloring not unlike many 

 forms of the Rice rat (Oryzomys), and is a rather small species. 



GENUS ORYZOMYS. 



Oryzomys. Baird, N. Am. Mamm., 1857, p. 458. 



Oryzomys albiventer. Merr. Proc. Wash. Acad. Nat. Scien., 



1 90 1, p. 279. 



Four specimens, three from Puenta de Ixtla, State of More- 

 los, and one from Balsas River, State of Michoacan. 



*Ine\oratns, unasked, not desired. 



