SOUTH AMERICAN NEMATOGNATHI. 127 



29. Rhamdia poeyi sp. no v. 



Type, one specimen. Length .175 ni. (to base of caudal fin); Goyaz; 

 Senhor Houorio. 



Width of the body about equal to its depth; much com- 

 pressed toward the caudal fin. Head short, flat above, the 

 sides not very steep, the greatest width 1^ in its length. 

 Fontanel not continued behind the eyes. Occipital pro- 

 cess very short, triangular, reaching two-sevenths the dis- 

 tance from its base to the dorsal spine. A few large pores 

 about the head. 



Eye 3 in snout, 7 in head, IJ in the interorbital. 



Maxillary barbels scarcely reaching the vertical from the 

 dort^al spine; post-mental barbels about reaching to the gill 

 opening, the mentals less than half as long. Branchiostegal 

 membranes separate to below the anterior part of the eyes. 

 Gill-rakers 3-J-7. 



Distance of dorsal spine from tip of snout less than 3 in the 

 length. Distance of adipose fin from the dorsal fin equals 

 the length of the dorsal; adipose fin very low in front, its 

 base about 3^ in the length. 



Pectoral and ventral fins very short; pectoral spine short, 

 terete, about half as long as the head, its outer margin 

 smooth, the inner margin with strong teeth the entire 

 length. 



Color brown, the sides and back densely covered 

 with small brown dots and more minute black dots; a dark 

 humeral spot, a narrow dark lateral band. 



Head 4^; depth, above first anal ray, 7; depth of pe- 

 duncle 91;^ Br. 6; D. I, 6; A. 13. 



30. Rhamdia tenella sp. nov. 



Type, No. 7547. Length .31 m. Cndajas. 

 Width behind the head equal to the depth, tapering to 

 the strongly compressed, caudal peduncle. Head broad 

 and flat transversely, its greatest width 1^ in its length; 

 profile regularly and strongly convex; width at angle of 

 mouth 2 in length of head. Fontanel a narrow slit be- 



