MAMMALS OF THE MEXICAN BOUNDARY. 



367 



Type-localitij. — Sweden. 



Description. — Size small. Leiii^th, 180 mm.; tail vertebra^, 85; 

 hind foot, 19; ear from notch, 15. Color, brownish gra}^ above, paler 

 (sometimes pinkish) l)elow. Manuna\ 4 (often 5) pairs. Iris dark 

 brownish gra}^. 



Remarks. — Found in greater or less abundance in all of the settle- 

 ments of the Southwest. In addition to the localities from which 

 specimens are listed, I have seen the house mouse in Prescott, Arizona, 

 in 1884, at Phoenix in 1885, and at Flagstalf, Arizona, on June 20, 1886. 

 None were seen or heard of in the Mexican towns on the Sonoyta 

 River, in the State of Sonora, Mexico. 



Record and measurements of 19 specimens of Mus inusculus. 



o Mammae, 4 pairs. 

 6Mamm?e, 5 pairs. 



cMammse, 5 pairs. Iris dark, brownish gray, 

 fi Strongly yellowish. Mammge, 5 pairs. 



Subfamily CRICETIlSr^^E. 



« .\mencan Museum of 

 Natural History. 



Grinding teeth rooted and either flattened (in the genera Signiodon, 

 Nectomys, etc.) or tuberculated {Onychomys, Baioniys, Peromyscus, 

 Oryzoniys, Beitlirodontomys, etc.). When tuberculate, the tubercles 

 are arranged in two longitudinal rows. 



