54 MEMOIRS OF THE CARNEGIE MUSEUM. 



Maxillary teeth six or seven; premaxillary with six to eight conical teeth and 

 two to four with lateral cusps ; mandible with ten conical teeth and four with lateral 

 cusps; maxillary extending considerably beyond the anterior margin of the eye. 



Origin of dorsal midway between tip of snout and base of caudal. Pectorals 



Fig. 15. Megalamphodus heteresthes (Ulrey), a, top of head, showing frontal (/) and occipital (o) fon- 

 tanels; b, maxiUary; c, premaxillary. 



extending beyond tips of the axillary scale; ventrals reaching anal; anal rays 

 graduate. 



No humeral or caudal spots, the upper half of the first developed rays of the 

 dorsal black. 



28. Megalamphodus micropterus sp. nov. (Plate VIII, fig. 1.) 



6900a, C. M., t3rpe, 30 mm. 6901a-q, C. M., paratypes, seventeen, largest 



about 28 mm. Lagoa do Porto, Dec. 24, 1907. Haseman. 

 6904a, C. M., paratype, one, 27 mm. Rio Salitre. Haseman. 

 6902a-i, C. M., paratypes, nine, largest 30 mm. Santa Rita, Jan. 24, 1908. 



Haseman. 

 6903, C. M., paratypes, thirty-five, largest 32 mm. Pirapora, Dec. 14, 1907. 



Haseman. 

 6905a-d, CM., four in bad state. Boqueirao near mouth of Rio Preto. 

 This species from the basin of the Rio San Francisco is similar to eques, from 

 which it differs at least in the number of anal rays. 



Head 3.4; depth 2.4-2.75; D. 11; A. 24-26; scales 5 to 7 + 24 to 27. Eye 

 2.5, much larger than the interorbital. 



Similar to M. megalopterus in shape, the back not quite so elevated; predorsal 

 area with nine or ten scales. 



Mouth large, the maxillary not quite as long as the eye, not reaching to suture 

 between the second and third suborbitals; premaxillary with seven to nine teeth, 

 of which one or two may be conical, the rest tricuspid; maxillary with two to six 



