PEROMYSCUS. 47 



Measurements. Total length, 206; tail, 116; hind foot, 21. Skull: 

 Total length, 25.5; Hensel, 19.4; zygoma tic width, 12.5; intertempo- 

 ral width, 4; length of nasals, 10.2; length of upper tooth row, 3.7; 

 length of mandible, 13.2; length of lower molar series, 3.3. Ex type 

 in United States National Museum. 



Peromyscus stephani Townsend. 



Peromyscus stephani Townsend, Bull. Am. Mus. Nat. Hist., XXXI, 

 1912, p. 126. 



Type locality. San Esteban Island, Gulf of California, Mexico. 



Genl. Char. Similar in color to P. eremicus, tail slightly shorter. 

 Skull has a greater inter temporal width, and a broader, heavier ros- 

 trum, and the nasals extend beyond premaxillaries. 



Color. Head and upperparts yellowish gray mixed with black, 

 darkest on dorsal line; flanks rich buff; entire underparts and inner 

 side of legs white; base of fur black; outer side of legs like flanks; 

 hands and feet white; tail above dark brown, becoming blackish on 

 terminal third. Ex type in United States National Museum. 



Measurements. TotaHength, 199; tail, 100; hind foot, 23. Skull: 

 Occipital region lacking; skull broken; zygomatic width, 14; inter- 

 temporal width, 4.3; length of nasals, 10.3; length of upper molar 

 series, 4; length of mandible, 12; length of lower molar series, 4.1. 

 Ex. type in United States National Museum. 



Peromyscus guardia Townsend. 



Peromyscus guardia Townsend, Bull. Am. Mus. Nat. Hist., XXXI, 

 1912, p. 126. 



Type locality. Angel de la Guardia Island, Gulf of California, 

 Mexico. 



Genl. Char. Larger than P. eremicus; rostrum longer; incisive 

 foramina longer reaching anterior plane of first molar. 



Color. Head and upperparts yellowish gray mixed with black, 

 lightest on head, darkest on lower back and rump; flanks pale orange- 

 buff; entire underparts white, base of fur plumbeous; outer side of 

 limbs like flanks; hands and feet white; tail above at base very pale 

 yellowish brown, grading to darker brown on central portion, and 

 becoming blackish on terminal third. Ex type in United States 

 National Museum. 



Measurements. Total length, 214; tail, 114; hind foot, 23. Skull: 

 Occipito-nasal length, 26; Hensel, 20; zygomatic width, 12.4; inter- 

 temporal width, 4; length of nasals, 11.7; palatal length, 8.5; length 

 of upper molar series, 3.9; length of mandible, 9.9; length of lower 

 molar series, 3.5. Ex type in United States National Museum. 



