Collected by Charles Frederick Hartt. 269 



lenfjth. No lateral l>and. The origin of the dorsal fin behind the 

 base of the ventrals. Maxillary toothless, reaches anterior border 

 of the orbit. Head 4, depth 2^-21 . A. 26, scales 7-35-6. 



78. aeneus. 



PP. Humeral -yxif present, no caudal spot, depth a little less titan twice 

 in the length. Maxillary extends to the eye. Dorsal fin over the 

 middle of the base of the venti-al. Head 4, scales 7-34-7. A. 28. 



79. chrysargyreus. 

 zzzzz. Scales in the lateral line 28-33. 



Q. A series of seven deep-hroicn longitudinal lateral bands. Maxillary ex- 

 tends not evidently beyond the front margin of the eye. Head 3f , 

 depth a little more than two in length. A. 27, scales 5-31-4. 



80. lineatus. 

 QQ. No series of longitudinal bands on the sides. 

 E. A silvery lateral band. 



S. Xo caudal or humeral spot. Tlie pectoral reaches the ventral. Tlie 

 dorsal over the base of the ventral. Head 3|, depth 2J. A. 28, 

 scales 5-30 to 33-5 81. grandisquamis. 



SS. Humeral spot present, generally more or less elongate. No 

 caudal spot. 

 T. 3Iaxillari/ with iiutncrous minute teeth, extends beyond the front 

 edge of the orbit. Snout shorter than the eye. Dorsal fin 

 over the root of the ventral. A. 29-30, scales 5 or 6-32 or 

 33-4.^ or 5. Head 3^, depth 2^-2^ 82. bahiensis. 



TT. :Maxillary without teeth. 



U. The narrow silvery band edged above with greenish, humeral 

 spot indistinct. Origin of the dorsal fin jiist behind the ven- 

 tral. Tlie pectoral reaches to the middle of the base of the 

 ventral. Head 3§-3f , depth 2i-2^. A. 24-25, scales .5-32 

 or 33-3i 83. coUettii. 



UU. Silver)/ hand not edged above irith greenish, humeral spot 

 large, faded. Maxillary reaches nearly' to the middle of the 

 eye. Dorsal fin o\'er the base of the ventral. 



84. xinguensis. 



SSS. Humeral and caudal spot present, the entire anterior third if the 

 caudal dark colored. Maxillary toothless. Head 3|, depth 2|. 

 A. 26-27, scales 5-28-4 85. agassizii. 



ER. No silvery lateral band. 



V. Scides 5^-31-6. A. M. Depth 2. Caudal spot diffuse extending 

 over the base of the jin. Humeral spot indistinct. Maxillary ex- 

 tends somewhat beyond the anterior margin of the eye. Origin 

 of the dorsiil fin immediately (behind the root of the ventral. 

 The pectorals extend beyond the ventrals, the ventrals to the 

 Aent. Diameter of the eye more than the width of the interor- 

 bital, less than the snout, one-third of the head. Head 3s. 



86. ovalis. 



