SYLVILAGUS. 117 



length of upper molar series, 11.9; length of mandible, 32.2; length of 

 lower molar series, 12.5. Ex type in American Museum of Natural 

 History. 



This race appears to grade on all sides into such forms as S. a. 

 minor and S. a. arizonce, so that it is difficult to characterize some 

 examples, but as a rule the specimens are more strongly buff on back 

 and lower neck. 



Sylvilagus auduboni warreni Nelson. 



Sylvilagus auduboni warreni Nels., Proc. Biol. Soc. Wash., XX, 

 1907, p. 83. 



Type locality. Coventry, Montrose County, Colorado. 



Geogr. Distr. Southwestern Colorado, southeastern Utah, north- 

 western New Mexico, northeastern Arizona, including lower half of the 

 valley of the Little Colorado River, to east base of San Francisco 

 Mountain, and to Henry Mountains, southeastern Utah. Vertical 

 range from about 5000 to 8500 feet in northwestern New Mexico. 

 Zonal range mainly upper Sonoran, extending into transition and lower 

 Sonoran zones. 



Genl. Char. Like S. a. baileyi but darker in color. Typical speci- 

 mens are distinguishable from the species compared, but those exhib- 

 iting the various gradations towards other forms are not so readily 

 recognized. 



Color. Top of head and upperparts cream-buff, the back washed 

 with black; nape pale rusty rufous; rump iron-gray; front and outer 

 side of fore legs rusty ochraceous-ruf ous ; top of fore feet white ; back 

 and outer side of hind legs cinnamon; top of hind feet wide; lower 

 border of flanks buff; neck beneath dark buff; underparts of body 

 white; inguinal portion dark buff; tail above iron-gray; outer side of 

 ears grayish washed with black. Ex type in United States National 

 Museum. 



Measurements. Total length, 375; tail, 51; hind foot, 102. Skull: 

 Occipito-nasal length, 68.5; Hensel, 52; zygomatic width, 34.8; 

 intertemporal width, 12.5; length of nasals, 21.3; palatal length, 7.8; 

 length of upper molar series, 12; length of lower molar series, 12. 

 Ex type in United States National Museum. 



This form, like S. a. cedrophilus, is recognizable in the typical style, 

 but difficult to recognize in its various gradations. 



Sylvilagus auduboni neomexicanus Nelson. 



Sylvilagus auduboni neomexicanus Nels., Proc. Biol. Soc. Wash., 



XX, 1907, p. 83. 

 Type locality. Fort Sumner, Guadalupe County, New Mexico. 



