ZAPUS. 103 



Measurements. Total length, 232; tail, 112; hind foot, 27.5. 

 Skull: Total length, 31.8; Hensel, 22.7; zygomatic width, 14.9; 

 intertemporal width, 8; length of nasals, 13.5; length of upper molar 

 series, 4.8; length of mandible, ; length of lower molar series, 

 13.2. Ex type in American Museum of Natural History. 



Dr. Allen has described this- species (I. c.) as "dusky gray" but 

 there is not a vestige of that hue anywhere visible, except upon the 

 outer side of the limbs, which have a grayish tint. 



Liomys guerrerensis Goldman. 



Liomys guerrerensis Goldm., N. Am. Fauna, No. 34, 1911, p. 62. 



Type locality. Omilteme, Guerrero, Mexico. 



Geogr. Distr. Humid forested Pacific slopes of the Sierra Madre 

 in the vicinity of the type-locality. Humid Tropical Zone. 



Genl. Char. Similar to L. irroratus, but darker skull with heavy 

 rostrum; narrow palate; frontals broad. 



Color. Top of head and upperparts glossy black grizzled with 

 buff; sides of body and outer side of hind legs mouse-gray; lateral 

 line faint buff; outer side of arms grayish; underparts, hands and 

 feet white; heels and inner side of ankles brownish black; tail above 

 black, beneath white; ears black, edge white. Ex type in United 

 States National Museum. 



Measurements. Total length, 255; tail, 127; hind foot, 34. 

 Skull: Occipi to-nasal length, 32.9; Hensel, 24; zygomatic width, 16; 

 intertemporal width, 8.6 ; length of nasals, 13.2 ; length of upper molar 

 series, 5.5; length of mandible, 15.4; length of lower molar series, 5.1. 

 Ex type in United States National Museum. 



Family Zapodidae. Jumping Mice. 



Subfamily Zapodinae. 



Genus Zapus (100). 



Zapus luteus Miller. 



Zapus luteus Miller, Proc. Biol. Soc. Wash., XXIV, 1911, p. 253. 



Type locality. Espagnola, New Mexico. Type in United States 

 National Museum. 



Genl. Char. Resembling Z. I. alleni Elliot, but upperparts brighter, 

 back less dark. Skull smaller and more slender. 



Color. Upperparts ochraceous; dorsal area very little of this 

 color evident, but grading into sides without line of demarcation; 



