PEROMYSCUS. 187 



Geogr. Distr. State of Chihuahua, north to White, Chiricahua 

 and Graham Mountains of Arizona. 



Genl. Char. Similar to P. gambeli, but smaller; longer ears and 

 shorter tail. 



Color. Above dark plumbeous slate; below whitish; tail bicolor. 



Measurements. Total length, 158; tail vertebrae, 67; hind foot, 

 24. Skull: occipito-nasal length, 24; Hensel, 10; zygomatic width, 

 12; interorbital constriction, 4; length of nasals, 10; palatal length, 

 10 ; length of upper molar series, 3. 



ft. flaocidus (Peromyscus) , Allen, Bull. Am. Mus. Nat. Hist., 1903, 



P- 599- 

 FEEBLE MOUSE. 



Type locality. Rio Sestin, State of Durango, Mexico. Altitude, 

 7,500 feet. 



Genl. Char. Similar to P. t. arizon, but paler; tail longer; hind 

 foot shorter. 



Color. Upper parts dark fawn brown, blackish on median area; 

 lateral line fulvous; head grayer than body; under parts pure white, 

 under fur plumbeous; fore legs white to shoulder; body color extend- 

 ing on hind leg to tarsal joint; tail above dark brown on upper third, 

 rest grayish white, beneath paler; ear gray brown margined nar- 

 rowly with white. 



Measurements. Total length, 177; tail vertebrae, 79; hind foot, 

 20; ear from crown, 14; from notch, 18. 



c. dementis (Peromyscus}, Mearns, Proc. U. S. Nat. Mus., 1896, 



p. 446. Elliot, Syn. N. Am. Mamm., 1901, p. 130. 

 SAN CLEMENTE ISLAND MOUSE. 



Type locality. San Clemente Island, California. 



Geogr. Distr. Coronodos Islands, Mexico, and San Clemente 

 Island, California. 



Genl. Char. Much blacker than P. thurberi, and of a more red- 

 dish coloration, save on the head. 



Color. Top of head drab gray; upper parts drab, tinged with 

 burnt umber; ears black; feet and under surface white; tail bicolor. 



Measurements. Total length, 177; tail vertebrae, 77; hind foot, 

 21 ; ear, 17. 



d. coolidjSii (Peromyscus), Thomas, Ann. Mag. Nat. Hist., 7th 



Ser., i, 1898, p. 45. 

 COOLIDGE'S FIELD MOUSE. 



Type locality. Santa Anita, Cape Region, Lower California, Mexico. 



Geogr. Distr. Cape Region, Lower California. 



