34 2 Bulletin American Museum of Natural History. [Vol. XX, 



cancrivorus group, two of which are from Suapure and three 

 from Maripa. The Suapure specimens are larger (on the 

 basis of the skulls) and grayer than the Maripa animals, with 

 rmich less rufous suffusion. These, in the absence of Guiana 

 specimens for comparison, I provisionally refer to the coast 

 form, cancrivorus. They are gray above, heavily varied with 

 black along the middle of the back and upper surface of the 

 tail, with little buffy suffusion, even of the underfur, and this 

 mainly restricted to the sides of the neck, below and behind 

 the ears ; below buff, paler on the breast and inguinal region ; 

 chin blackish, the black extending back for 175 mm.; limbs 

 yellowish buff, strongest on the sides and washed with black- 

 ish on the anterior surface. Total length, $ 958; $ 933; 

 head and body, $ 660, ? 635; tail vertebrae, $ 298, $ 305; 

 hind foot (approximate from dry skin), $ 144 (with claws 

 150), ? 144 (with claws 150); ear (dry), $ 62, $ 60. Skull, 

 total length, $ 148.5, $ 145.5; basal length, $ 139, ? 138; 

 zygomatic breadth, $ 82, $ 77. 



The other three specimens agree well with the description of 

 Canis cancrivorus savannarum Thomas, except that they are 

 a little larger; they are provisionally referred to that form, 

 as follows: 



26. Canis (Thous ) cancrivorus savannarum Thomas. 

 Three specimens, two adult males, Maripa, Dec. 24 and 29, 

 and a half-grown female, Maripa, Aug. i. 



The December specimens are in greatly worn pelage, the 

 long hairs on the back in one of the specimens and on the tails 

 in both being greatly worn. In fresh pelage the whole back 

 from the shoulders posteriorly is evidently strongly varied 

 with black, as in the Suapure specimens. The underfur is 

 strongly instead of faintly suffused with buff, brightening to 

 orange buff on the neck, including the region of the ears 

 and top of the head; pectoral region, insides of limbs, and 

 the tail (except median line above), also deep orange buff; 

 the rest of the ventral surface -deep buff. Even the surface 

 color on the sides of the neck and the area surrounding the 

 ears is deep rusty buff. 



As already said, these specimens are smaller than those 



