50 PEROMYSCUS. 



Gent. Char. Similar to P. keeni, rostrum longer and more slender. 



Color. Top of head, nose, upperparts and flanks russet mixed with 

 dusky on scapular region, and with black on dorsal region; underparts, 

 sides of face and lips, hands and feet white; tail above blackish brown, 

 beneath whitish. Ex type in United States National Museum. 



Measurements. Total length, 215; tail, 107; hind foot, 19.4 

 (skin). Skull: Occipito-nasal length, 26.6; Hensel, 21.3; zygomatic 

 width, 13.1; intertemporal width, 13.7; length of nasals, 10.6; length 

 of upper molar series, 4. Ex type in United States National Museum. 



Peromyscus maniculatus algidus Osgood. 



Peromyscus maniculatus algidus Osgood, N. Am. Fauna, No. 28, 

 1909, p. 56. 



Type locality. Head of Lake Bennett, British Columbia, Canada. 



Geogr. Distr. Headwaters of the Yukon River, from Lake Bennett 

 to the lower part of the Lewis River. 



Geol. Char. Similar to P. m. hylceus, but paler, more gray. 



Color. Entire upperparts cinnamon, mixed with dusky on sides 

 and dorsal region; washed with grayish on head and face, and in some 

 specimens, also on shoulders; orbital ring and spot at base of whiskers 

 dusky; underparts creamy white; feet and hands white; tail blackish 

 above, beneath white. Ex type in United States National Museum. 



Measurements. Total length, 227; tail, 1 08; hind foot, 18.3 (skin). 

 Skull: Occipito-nasal length, 27.1; Hensel, 20.8; zygomatic width, 

 13.6; intertemporal width, 4.3; length of nasals, 10.8; length of upper 

 molar series, 4; length of mandible, 11.4; length of lower molar series, 

 4.4. Ex type in United States National Museum. 



Peromyscus maniculatus margaritae Osgood. 



Peromyscus maniculatus margaritce Osgood, N. Am. Fauna, No. 28, 

 1909, p. 95. 



Type locality. Margarita Island off west coast of southern Cali- 

 fornia, Mexico. 



Genl. Char. Similar to P. m. coolidgei, but paler. 



Color. Head, entire upperparts and flanks pinkish buff lined with 

 dusky; nose and entire underparts, limbs, hands and feet white; 

 base of hairs slaty except those on throat which are white to the roots; 

 tail above dusky, beneath white; ears whitish at base, dusky at tips. 

 Ex type in United States National Museum. 



Measurements. Total length, 167; tail, 70.5; hind foot, 20.9 (skin). 

 Skull: Occipito-nasal length, 25.2; Hensel, 19.1; zygomatic width, 

 13; intertemporal width, 3.8; length of nasals, 9.7; length of upper 

 molar series, 3.5; length of mandible, 10.3; length of lower molar 

 series, 3.6. Ex type in United States National Museum. 



