150 PEROMYSCUS. 



black; ear inside orange at base, rest black, outside pale brown on 

 basal half, rest blackish with white edge. 



Measuretnents. Total length, 220; tail vertebrae, ii6; hind foot, 

 23; ear, 19. Skull: occipito-nasal length, 25.5; Hensel, 19; zygo- 

 matic width, 12; interorbital constriction, 4 ; palatal length, 9.5; 

 width of braincase, 11.5; length of nasals, 9.5; width of rostrum, 3; 

 length of upper tooth row, 3; length of mandible, 11.5; height at 

 condyle, 4.5. 



297. Peromyscus mearnsi (Allen). 



Vesperimus ynearnsii Allen, Bull. Am. Mus. Nat. Hist. N. Y., 



1891, p. 300. 

 Peromyscus mearnsi Elliot, Syn. N. Am. Mamm., F. C. M. Pub., 11, 



1901, p. 132. Zool. Ser. 

 Mearns' Field Mouse. 



Type locality. Brownsville, Cameron County, Texas. 

 Geogr. Distr. Texas to Arizona. 



298. Peromyscus canus Meams. 



Peromyscus canus Meams, Proc. U. S. Nat. Mus., 1896, p. 445, 

 Elliot, Syn. N. Am. Mamm., F. C. M. Pub., 11, 1901, p. 132. 

 Zool. Ser. 

 Hoary Field Mouse. 



Type locality. Fort Clark, Kinney County, Texas. 



Geogr. Distr. Texas to Oklahoma Territory. 



299. Peromyscus boylii (Baird). 



Hesperomys boylii Baird, Proc. Acad. Nat. Scien. Phil., 1855, p. 335. 



Sitomys gilberti Allen, Bull. Am. Mus. Nat. Hist. N. Y., 1893, p. 188, 



Peromyscus boylii Elliot, Syn. N. Am. Mamm., F. C. M. Pub., 11, 



1 90 1, p. 132. Zool. Ser. Id. Mamm. Middle Amer. & W. 



Indies, F. C. M. Pub., iv, Pt. i, 1904, p. 195. Zool. Ser. 



Boyle's Field Mouse. 



Type locality. American River, Eldorado County, California. 

 Geogr. Distr. Central and eastern California. 



a. Peromyscus hoylii peniciUatus Mearns. 



Peromyscus boylii penicillatus Meams, Proc. U. S. Nat. Mus., 

 1896, p. 139. Elliot, Syn. N. Am. Mamm., F. C. M. Pub., 11, 

 1901, p. 133. Zool. Ser. Id. Mamm. Middle Amer. & W. 

 Indies, F. C. M. Pub., iv, Pt. i, 1904, p. 196. Zool. Ser. 

 Penciled Field Mouse. 



Type locality. Foothills of Franklin Mountains, near El Paso, 

 El Paso County, Texas. 



Geogr. Distr. Northwestern Texas. 



