EDWIN CHAPIN STARKS 25 



gill opening, a light stripe longitudinal along the posterior half of the side, 

 which may be absent, and the fins are light straw-color. 



78. Gymnotus carapo Linnaeus. 



Specimens were taken at Para and at Lake Papary. The following 

 color note was made from a fresh specimen from the former locality. The 

 back is a very dark dusky-greenish-brown, shading through soiled sienna on 

 the side to dusky-bluish below. The cross bars are black and the anal and 

 pectoral are dusky. 



Family ELECTROPHORID^. 



79, Electrophorus electricus (Linnaeus). 



Two specimens were taken at Para. They were dusky-yellowish-green 

 above, growing yellow on the sides and bright yellow on the lower part of 

 the head, while the lower part of the body was drab, growing lighter 

 anteriorly and merging with the yellow of the head. Blended light spots, 

 as big as the eye, were scattered over the body, and the margin of the ver- 

 tical fin was light yellow. 



Family BUNOCEPHALID^. 

 80. Platystacus cotylephorus Bloch. 



A single specimen was taken at Para. 



81. Aspredo aspredo (Linnaeus). 



Three specimens of this species were collected at Para. 



Family SILURID^. 



82. Felichthys bagre (Linnaeus). 



Three specimens were collected at Para. There is considerable varia- 

 tion among specimens of the same length in the length of the barbels. In 

 two of them, 15 inches long, the maxillary barbel reaches to the end of the 

 ventral in one, and to the end of the anal in the other. The mental bar- 

 bel reaches nearly to the pectoral base in one, and scarcely past the eye in 

 the other. The pectoral filament reaches past the tips of the middle caudal 

 rays in one, and not to the caudal in the other. The pectoral filament 

 reaches past the anterior fourth of the anal in one, and to the posterior 

 fourth in the other. The interorbital bone cannot be described as flat in 

 these specimens, for it is considerably convex. 



