PEROMYSCUS. 183 



9.8X2.5; palatal length, 3.5; palatine foramina, 5.7x2; postpalatal 

 length, 9.1; length of upper molar series, 3.8. 



leueopus fulvus. 



sonoriensis fulvus (Peromyscus) , Osgood, Proc. Biol. Soc. Wash., 



xvii, 1904, p. 57. 

 FULVOUS MOUSE. 



Type locality. Oaxaca City, State of Oaxaca, Mexico. 



Genl. Char. Similar to P. I. sonoriensis, but darker. " Skull with 

 anterior part of zygoma heavier, more deeply notched by infraorbital 

 foramen." 



Color. Upper parts russet; middle of back mars and Prout's 

 brown; under parts creamy white; ear tufts buffy or pale cream 

 color; hands, arms, and feet white; outer side of ankles brownish; 

 tail above brown, beneath white. 



Measurements. Total length, 167; tail vertebrae, 68; hind foot, 

 22. Skull: greatest length, 25; Hensel, 19.5; zygomatic width, 12.8; 

 interorbital constriction, 4; interparietal, 8x2.1; length of nasals, 10; 

 length of palate, 3.7 ; palatal foramina, 5.6x2 ; postpalatal length, 8.7 ; 

 length of upper molar series, 3.8. 



139. exiguus (Peromyscus}, Allen, Bull. Amer. Mus. Nat. Hist., 1898, 



P- 157- 

 SAN MARTIN ISLAND MOUSE. 



Type locality. San Martin Island, Lower California, Mexico. 



Geogr. Distr. Lower California, Mexico. 



Genl. Char. Similar to P. t. dementis, smaller, tail shorter. 



Color. Head and back dark rufous brown, darkest on upper 

 back, but no dorsal stripe; flanks pale rufous; upper lip, chin, and 

 under parts pure white; orbital ring black; ears like back; tail above 

 dark brown, beneath white; feet white. 



Measurements. Total length, 158; tail vertebras, 69; hind foot, 

 20. Skull: total length, 26.5; basal length, 22; mastoid breadth, 

 11.5; interorbital constriction, 3.5; length of nasals, 10. (ex Type.) 



140. cherrii (Hesperomys), Allen, Bull. Amer. Mus. Nat. Hist., 1891, 



p. 21 i. 

 CHERRIE'S COSTA RICAN MOUSE. 



Type locality. La Carpintera, Costa Rica. 



Geogr. Distr. Costa Rica. 



Genl. Char. Similar to P. nuttalli, but whiter beneath; ears 

 larger, tail much longer. 



Color. Above dark cinnamon rufous, lined with black on the 

 head and dorsal region; flanks rusty cinnamon; upper lip on a line 



