32 NORTH AMERICAN FAUNA. [Xo.iL 



parasites in the frontal sinuses. The young skull affords the following' 

 measurements: Basal length, r>0; /ygomatic breadth, 29; postpalatal 

 length, 20; palatal length, 21; interorbital breadth, 12; breadth across 

 postorbital processes, 15; breadth of constriction, 14. 



General remarks. There are several specimens from Costa Rica in 

 the National Museum collection which apparently belong to this 

 species. In these specimens the color of the upper parts is exceed- 

 ingly dark from the color of the tips of the hairs; but the color imme- 

 diately underlying the black tips is deep fulvous brown, giving a very 

 rich tone to the pelage. The orange of the under parts is narrow and 

 does not reach the feet; on the hind legs it stops on the thighs, and on 

 the forelegs it stops short of the wrists. 



Measurements (from dry skins in U. S. Nat. Mus.). Total length, 

 about 010; tail vertebra', about 180; hind foot, about 52. 



