August, 1910. MAMMALS FROM SOUTH AMERICA OSGOOD. 29 



from Aruba, the type locality of this species, is in rather worn bleached 

 .coat much paler than that of the one from Curacao, which is quite 

 fresh and new. The skull of the Curacao specimen also differs in 

 narrower nasals and interorbital region and in slightly weaker denti- 

 tion. Without additional material it is impossible to judge of the 

 importance of these differences. 



Sylvilagus margaritae (Miller). 



Thirteen specimens, Puerto Viejo (5), Porlamar (i), and Macanao 

 (7), Margarita Island, Venezuela; collected by J. F. Ferry. A few 

 of this series have the under side of the tail nearly pure white and the 

 sides lighter and more grayish than the back, thus approaching the 

 coloration of S. cumanicus. The sides of the head and face are in 

 nearly all cases uniform grayish with slight buffy or more heavily 

 grizzled areas below the eye and between the eye and the ear. 



Sylvilagus avius sp. nov. 



Type from Testigos Islands (Testigo Grande), Venezuela. No. 

 16,593 Field Museum of Natural History. Adult female. Collected 

 February 14, 1909, by John F. Ferry. 



Characters. Similar to Sylvilagus margaritce but smaller and 

 darker; skull smaller and relatively broader; audital bullae smaller. 

 Upperparts pale cinnamon rufous and black, the hairs rufous sub- 

 terminally and broadly black terminally; shoulders and rump slightly 

 lighter than back but not grayish as in 5. cumanicus and S. super- 

 ciliaris; top of head rich cinnamon rufous finely mixed with black, 

 darker than in allied forms; upper side of tail, hind legs and sides of 

 hind feet nearly clear cinnamon rufous ; a buffy white line over the 

 eye and a rufous spot below it ; remainder of sides of face pale whitish 

 clay color mixed with black, the black more intense posteriorly where 

 it forms a rather distinct blackish area between and below the eye and 

 the ear; underparts dull whitish, strongly tinged with buff on the 

 chest and along the sides of the belly where the transition to the color 

 of the sides is rather gradual ; under side of tail dull dark buff. Skull 

 rather short and broad ; incisor teeth relatively heavy , cheek teeth 

 weaker than in margaritce; audital bullae smaller. 



Measurements. Type: Total length 420; tail vertebrae. 20; hind 

 foot 85; ear 53. Skull of type: Greatest length 74.5; basilar length 

 57-7! zygomatic breadth 36; interorbital breadth 19.2; combined 

 width of nasals 15.6; diastema 21.2; width between outer sides of 

 maxillary toothrows 23.2 ; alveolar length of maxillary toothrow 15.3. 



