118 SYLVILAGUS. 



Geogr. Distr. Pecos Valley from near Fort Stockton, Texas, 

 north to about Fort Sumner, New Mexico, and thence east to Abilene 

 and Wichita Falls, Texas, and north through eastern New Mexico, 

 western Texas and western Oklahoma to extreme south-central 

 Kansas. Vertical range from about 2500 feet in western Texas to 

 5000 feet in eastern New Mexico. Zonal range lower Sonoran and 

 lower part of upper Sonoran zone. 



Genl. Char. Like S. a. minor but ears shorter and hind foot longer. 

 Skull has longer nasals, smaller bullae, intertemporal width greater 

 and a more flattened frontal area. 



Color. Top of head and back dark buff-gray tinged with rusty 

 buff; flanks similar to back, but more gray; shoulders deep rusty buff ; 

 nape rufous; outer side of fore legs bright rusty rufous; top of fore 

 feet dark buff; outer side of hind legs rusty cinnamon; under side of 

 neck dark rusty buff; underparts of body white; outer side of ears 

 pale grayish buff; tail above buff-gray. Ex type in United States 

 National Museum. 



Measurements. Total length, 385; tail, 59; hind foot, 91. Skull: 

 Occipito-nasal length, 63.4; Hensel, 48.9; zygomatic width, 33.8; 

 intertemporal width, 11.2; length of nasals, 20; palatal length, 6; 

 length of upper molar series, 12.1; length of mandible, 44.7; length of 

 lower molar series, 12.7. Ex type in United States National Musem. 



As Mr. Nelson says "this is not a strongly marked form," but it 

 is separated as a race on account of the legs and shoulders being 

 more rusty reddish, the rusty buff tinge on rest of the body, and small 

 ears. 



Sylvilagus robustus (Bailey). 



Lepus pinetus robustus Bailey, N. Am. Fauna, No. 25, 1905, p. 159. 

 Davis Mountain Cottontail. 



Type locality. Davis Mountain, 6000 feet altitude, Texas. 



Geogr. Distr. Davis and Chisos Mountains, 6000 to 8000 feet 

 altitude. Zonal range Transition. 



Genl. Char. Similar to L. p. holzneri but larger; braincase nar- 

 rower; postorbital processes wider; bullae larger. 



Color. Winter Pelage. Crown and rump brownish gray; back 

 mixed buff and black; sides light ashy gray; nape bright fawn; 

 throat-patch buffy; lower parts white; outer side of limbs pale rusty 

 rufous. Ex type in United States National Museum. 



^Measurements. Total length, 460; tail vertebrae, 55; hind foot, 

 104; ear from notch, 67. Skull: Basal length, 60; length of nasals, 

 32; zygomatic breadth, 34; width of braincase, 26.5; intertemporal 

 width, 13; mastoid width, 25.5; length of upper molar series, 12.7; 



