ONYCHOMYS. PEROMYSCUS. 1:;0 



10 ; length of upper tooth row, 4 ; length of mandible, 1 5 ; length of lower 

 tooth row, 4. 



Genus 60. Peroniysc'us. 



Peromyscus Gloger, Hand- u. Hilfsb. Naturg., i, 1841, pp. xxx, 95. 

 Type Peromysctts arborens Gloger == Miis sylvnlii n\ novebora- 

 censis Fischer. 



Calomys Aud. & Bach., Quad. N. Am., n, 1851, p. 303. (nee Water- 

 house, 1837.) 



Sitomys Fitzin., Sitzungsb. Math. -Nat. Cl. K. Akad. Wiss. Wien, 

 LVI, 1867, p. 97. 



*Vesperimus Coues, Proc. Acad. Nat. Scien. Phil., 1874, p. 178. 



Baiomys True, Proc. U. S. Nat. Mus., xvi, 1894, p. 758. 



Trinodontomys Rhoads, Proc. Acad. Nat. Scien. Phil., 1894, p. 



257- 

 Haplomylomys Osgood, Proc. Biol. Soc. Wash., xvn, 1904, p. 53. 



vSubgenus. A. Baiomys. 



"Size very small. Ascending ramus of mandible short and erect. 

 Condyle terminal coronoid process well developed, uncinate, and near 

 condyle. Plantar tubercles six; soles hairy. Tail short.' 



264. Peromyscus taylori (Thomas). 



Hesperomys taylori Thomas, Ann. Mag. Nat. Hist., 5th Ser., xix, 



1887, p. 66. 

 Peromyscns taylori Elliot, Syn. N. Am. Mamm., F. C. M. Pub., n, 



1901, p. 141. Zool. Ser. 

 TAYLOR'S MOUSE. 



Type locality. San Diego, Duval County, Texas. 

 Geogr. Distr. Southern Texas. 



265. Peromyscus allex Osgood. 



Peromyscus allex- Osgood, Proc. Biol. Soc. Wash., xvn, 1904, p. 



76. Elliot, Mamm. Middle Amer. & W. Indies, F. C. M. Pub., 



iv, Pt. i, 1904, p. 175. Zool. Ser. 

 DWARF MOUSE. 



Type locality. Colima, State of Colima, Mexico. 

 Geogr. Distr. Unknown. 



266. Peromyscus musculus (Merriam). 



Sitomys musculus Merr., Proc. Biol. Soc. Wash., vm, 1892, p. 17 



*A subgenus of Hesperomys Coues. (nee Waterhouse.) 



