August, 1910. MamMALs FROM SoutH AMERIcA—OscGoop. 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 margarite (Miller). 
Thirteen specimens, Puerto Viejo (5), Porlamar (1), 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. 
a Characters. Similar to Sylvilagus margarite but smaller and 
darker; skull smaller and relatively broader; audital bulla 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 S. cumanicus and S. super- 
. etliaris; top of head rich cinnamon rufous finely mixed with black, 
E 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 margarite; audital bulle smaller. 
Measurements. Type: Total length 420; tail vertebre 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. 
