480 Dr. A. Giinther on some new Freshwater Fishes 



Lepmnnus hypselonotus. 



D. 10. A. 13. V. 9. L. lat. 37-38. L. transv. 6/7. 



The height of the body is contained twice and one-half or 

 twice and two-thirds in the total length (without caudal), the 

 length of the head four times and one-half or four times and 

 two-thirds. Back much elevated, with its profile very convex 

 to the dorsal fin. Body with seven more or less broad, 

 oblique, blackish cross bands — the two anterior in front of the 

 dorsal, the third from the anterior dorsal rays to behind the 

 ventral fins, the fourth corresponding to the vent, the fifth to 

 the middle of the anal, the sixth from the adipose fin, and the 

 seventh round the last caudal scales. Anterior part of the 

 base of the dorsal and the ventrals deep black, the other fins 

 yellowish. 



Xeberos. 



Tetragonopterus avails. 

 D. 11. A. 26. L. lat. 31. L. transv. 5|/6. 



The height of the body is one-half of the total length (with- 

 out caudal) ; the length of the head is contained thrice and 

 two-thirds in it. Upper profile rather more convex than 

 lower, slightly concave on the nape. The diameter of the 

 eye is more than the width of the interorbital space, less than 

 the length of the snout, and one-third of that of the head. 

 The maxillary extends somewhat beyond the vertical from 

 the front margin of the orbit. Origin of the dorsal fin imme- 

 diately behind the root of the ventral. Pectorals extending 

 beyond the ventrals, ventrals to the vent. There are four longi- 

 tadinal series of scales between the lateral line and ventral fin. 



Xeberos. 



Aphyocharax, g. n. 



This genus belongs to the Tetragonopterina^ and is, tech- 

 nically, distinguished from Chirodon by the presence of max- 

 illary teeth. 



Dorsal fin placed in the middle of the length of the body, 

 behind the ventrals ; anal rather long. Body oblong, covered 

 with scales of moderate size. Lateral line visible on a part 

 of the scales only. Abdomen rounded before the ventrals. 

 Cleft of the mouth narrow ; maxillary short ; intennaxillary, 

 maxillary, and mandibles with a single series of pointed teeth, 

 those in the intermaxillary having a minute lobe on one or 

 both sides ; all the others appear to be simply pointed. 



Aphyocharax pusillus. 

 D. 9. A. 18. V. 8. L. lat. 36. L. transv. 12. 

 Huallaga and Xeberos. 



