Ellis: Hasemania, Hyphessobrycon, and Hemigrammus. 155 



.1 dark line along the base of the anal. Fins all dusky, especially the 

 anal and lower lobe of the caudal. Scales all clearly outlined with 

 brownish. Cheeks and back thickly peppered with brown chromato- 

 phores. 



7. Hyphessobrycon duragenys sp. nov. 



Plate II, fig. 3. 



Type, 68 mm. C. M. No. 3023. Mogy das Cruzes, Rio Tiete. 



Cotypes, five specimens, 45 to 53 mm. C. M. No. 3024. Mogy das Cruzes. 



Cotypes, nine specimens, 28 to 43 mm. C. M. No. 3025. Jacarehy. 



Head 3.25-3.7; depth 2.5; D. io to 12; A. 16 to 18; scales 5 or 

 6 32 to 36-4 to 5. Eye small, 3.0 to 5.5 in the head; inter orbital wider 

 than the length of the eye, 2.8 to 3.2 in the head. Compressed, depth 

 of the head at the base of the occipital process 1.5 in the greatest 

 depth. Preventral and predorsal regions rounded, usually without 

 complete series of median scales. Occipital process about 5 in the 

 distance from its base to the dorsal, bordered by three or four scales. 

 Interorbital only slightly convex. Frontal fontanel triangular, as 

 wide as the parietal, and one-half to three-fourths as long as the 

 parietal without the occipital groove. Second suborbital usually in 

 contact with the preopercle. Third suborbital abou one-half as wide 

 as the eye. Mouth moderately large; snout short; maxillary equal to 

 the eye; mandible longer than the eye, 2.5 to 3 in the head. Pre- 

 maxillary with three or four tricuspid teeth in the outer row and a 

 graduated series of five three- to five-pointed teeth in the inner row. 

 Maxillary with one tricuspid tooth. Dentary with a graduated series of 

 four five-pointed teeth, followed by three or four narrow, conical teeth 

 on the sides. Gill-rakers 8 + 10. Anal sheath short, of about five 

 scales, covering the base of the first seven rays. Lateral line with pores 

 developed on nine to twelve scales. Origin of the dorsal a little more 

 than one-half the eye nearer to the caudal than to the snout; penulti- 

 mate ray one-half the longest, which is 3.5 to 4 in the length. Caudal 

 not as long as the head. Origin of the anal on the vertical from the 

 first or second scale behind the dorsal. Anal obliquely truncate, the 

 longest ray 1. 33 in the base. Ventrals on the vertical from the third 

 scale in front of the dorsal. Ventrals reaching the second or third 

 scale in front of the anal. Pectorals reaching the first or second scale 

 in front of the ventrals. Humeral spot narrow and vertically elongate. 

 Caudal spot intensely black, tapering forward into the lateral stripe, more 



