542 PEROMYSCUS. 



Famity IV. !!liii*i<lie. 



Subfamily 1 1 . Cricetinee. 



Genus 60. PtToiiiysous. 



278aa. /'r/-oin j/srn s Jck copns fnsns Bangs. 



Peromysctis leucopus jusiis Bangs, N. Eng. Zool. Club, iv, 1905, 



P- 13- 

 Martha's Vineyard Island Deer Mouse. 



Type locality. West Tisbury, Martha's Vineyard Island, Massa- 

 chusetts. 



Geogr. Distr. Martha's Vineyard Island, Massachusetts. 



Gertl. Char. Similar to P. I. novehoracensis, but larger. 



Color. Summer Pelage. Above rich brown, dorsal region darkest ; 

 beneath white; hands and feet white; ears dusky; tail blackish above, 

 white below. 



Measurements. Total length, 187-203; tail vertebrae, 85-96; 

 hind foot, 21.5-23.5. Skull: basal length, 25.8; occipito-nasal length, 

 28.4; length of nasals, 10.6; palatal length, 11.4; zygomatic width, 

 14.6; interorbital width, 4.4; length of mandible. 15.8; of upper 

 molar series, 3.8; of lower molar series, 3.6. 



278aaa. Peroniyscus hntf.npnfi tini nnxlyfr.s Bangs. 



Peromyscus leucopus ammodytes Bangs, Proc. N. Eng. Zool. Club, 

 IV, 1905, p. 14. 

 MoNOMOY Island Deer Mouse. 



Type locality. Monomoy Island, Massachusetts. 



Geogr. Distr. Known onlv from the tvpe localitv. 



Genl. Char. Smaller and paler than P. I. novehoracensis. 



Color. Above pale gray, beneath white; ill-defined dorsal stripe 

 sometimes present ; hands and feet white ; tail pale gray above, white 

 below, ears pale drab. 



Measurements. Total length, 151. 5-188; tail vertebrae, 67-88; 

 hind foot, 18. 8-21. Skull: basal length, 23.8 ; occipito-nasal length, 

 26; length of nasals, 10; palatal length, 10.4; zygomatic width. 13.6; 

 interorbital width, 4; length of mandible, 14.2 ; length of upper molar 

 series, 3.4; of lower molar series, 3. 



