120 SYLVILAGUS. 



side of fore legs fawn color; nape pale ochraceous; fore feet whitish; 

 outer side of hind legs similar in color to the back; hind feet white; 

 neck beneath pale gray; underparts of body white, base of fur plum- 

 beous; tail above gray, beneath white; ears gray. Ex type in United 

 States National Museum. 



Measurements. Total length, 315; tail, 32; hind foot, 68; ear, 

 63. Skull: Occipito-nasal length, 60.5; Hensel, 47.5; zygomatic 

 width, 28.3; intertemporal width, 9.6; length of nasals, 9.4; palatal 

 length, 4.2; length of upper molar series, 10.5; length of lower molar 

 series, 10.9. E)x type in United States National Museum. 



The size of the ears and bullae serve to distinguish this form when 

 compared with those of 5. b. cinerascens. 



Sylvilagus mansuetus Nelson. 



Sylmlagus mansuetus Nels., Proc. Biol. Soc. Wash., XX, 1907, 

 p. 83. 



Type locality. San Jose Island, Gulf of California. 



Geogr. Distr. San Jose Island, Gulf of California, Mexico. Verti- 

 cal range from sea-level up to an undetermined altitude on low moun- 

 tains. Zonal range lower Sonoran and upper border of arid tropical 

 zone. 



Genl. Char. Colors very pale; ears long. Skull long and narrow; 

 nasals very long; intertemporal width great; bullae large. 



Color. Top of head and back yellowish gray; tips of hairs black; 

 nape pale ochraceous-bufl; flanks paler and more gray; outer side of 

 fore legs ochraceous-clay color; fore legs white; back of hind legs 

 brownish; hind feet pure white; under side of neck pale gray; rest 

 of underparts of body white ; outer side of ears gray ; tail above mixed 

 black and buff. Ex type in United States National Museum. 



Measurements. Total length, 339; tail, 44; hind foot, 73; ear, 63. 

 Skull: Occipito-nasal length, 64.1; Hensel, 49.5; zygomatic width, 

 31.2; intertemporal width, 11.3; length of nasals, 18.9; palatal length, 

 5.2; length of upper molar series, 10.6; length of mandible, 28.5; 

 length of lower molar series, 11.5. Ex type in United States National 

 Museum. 



The unique type of this rabbit is assuming a winter pelage, and it is 

 not improbable that its paler appearance may be attributed, in a con- 

 siderable degree, to this fact. 



