334 Bulletin American Museum of Natural History. [Vol. XX, 



surface pale yellowish white instead of yellow. In these specimens 

 the head, neck, shoulders, and anterior half of the dorsal region are 

 strongly blackish suffused with gray; but the amount and conspicu- 

 ousness of the gray suffusion vary greatly in the different specimens. 



The collector's measurements of the type are: Tot-d length, 1041 

 mm.; tail vertebrae, 356; hind foot, 159; ear, 76. The four females 

 are smaller, averaging, total length, 952 (914-991); tail vertebrae, 

 316 (305-330); hind foot, 138 (137-146). Skull, type: Total length, 

 132; zygomatic breadth, 86; m 1 m 8 , 25; nij m 8 , 29. The females 

 are smaller, averaging 118 by 81. 



The type locality of Procyon cancrivorus is Cayenne, to 

 which probably the Trinidad animal is referable. A com- 

 parison of this species with a Trinidad specimen leads to the 

 conclusion that there is very little difference in size, and prob- 

 ably very little in coloration, taking into account the wide 

 variability in this respect of the Santa Marta series. But 

 there is a striking difference in the dentition of the two forms, 

 through the great reduction in massiveness of the teeth in P. 

 proteus. This is especially noticeable in the great length of 

 m 3 , which measures 13 x 7.5 in P. cancrivorus and 10.5 x 7.5 

 in P. proteus. The upper molar series has a length in P. can- 

 crivorus of 28 against 25 in P. proteus; the difference is still 

 greater in the lower molar series, which measures respectively 

 35.6 and 30. The premolar series is especially weak in P. 

 proteus, being less than half as massive as in a Trinidad ex- 

 ample of P. cancrivorus; the premolars are all separated by 

 distinct diastemata in P. proteus, but in P. cancrivorus they 

 are closely crowded, and in the lower jaw overlap on the 

 alveolar line. 



Nasua phaeocephala, sp. nov. 



Type, No. 17557, ? ad., Suapure, Caura district, Venezuela, Sept. 

 14, 1901; coll. S. M. Klages. 



Front and sides of head gray tinged with blackish, without distinct 

 facial markings of either black or white ; top of head grayish fulvous ; 

 nape, shoulders, thoracic region, and side of body dingy reddish brown, 

 more or less shaded with dusky; posterior half of dorsal region black- 

 ish slightly mixed with dark rusty brown hairs, the dark area passing 

 forward on the median line in a point about to the shoulders ; sides of 

 breast and lower abdomen dull rusty fulvous; costal area dull rusty 



