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NORTH AM?:RICAN FAUNA. 



[Xo.ll. 



parasites in tlie frontal sinuses. Tbc young skull affords tlie folio wing 

 measuremeuts : Basal length, 50: zygomatic breadth, 29; postpalatal 

 length, 26; palatal leu gth, 24: iuterorbital breadth, 12 ; breadth across 

 postorbital i)rocesses, 15; breadth of eoustrictiou, 14. 



General remarl's. — There are several specimens from Costa Rica in 

 the National Museum collectiou which apparently belong to this 

 species. In these specimens the color of the ui>per i)arts 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 stoi)S short of the wrists. 



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

 about 510; tail vertebne, about 180: hind foot, about 52. 



