On Two new South- American Gharacinoid Fishes. 449 



LI. — Descriptions of Tivo new South- American 

 Gharacinoid Fishes. By G. A. Boulenger, F.R.S. 



Leporinus semivittatus. 



Depth of body 3§ times in total length, length of head 4 

 times. Upper profile of head straight ; jaws equal ; incisors 

 pointed, brown-edged ; snout 1^ diameter of eye, which 

 is 4 times in length of head ; interorbital width 2^ times 

 in length of head ; eye equally distant from the end of 

 the snout and the gill-opening. Dorsal 13, equally distant 

 from the end of the snout and the base of the caudal, the sixth 

 ray opposite to the first ventral. Anal 10. Pectoral | length 

 of head, widely separated from the ventral. Scales 38 gf* 

 Olive above, silvery beneath ; an interrupted black stripe on 

 each side, on the lateral line, originating above the base of 

 the ventral ; fins whitish. 



Total length 115 millim. 



A single specimen from Manaos, Rio Negro, collected by 

 Mr. J. C. Antony. 



Xiphostoma lateristriga. 



Depth of body 8^ times in total length, length of head 3^ 

 times. Snout a little more than half length of head, ter- 

 minating in a cartilaginous appendage ,• cleft of mouth half 

 length of head ; diameter of eye 4 times in length of snout 

 (without appendage), 3 times in postorbital part of head, | 

 interorbital width. Dorsal 10, a little nearer base of caudal 

 than base of ventrals. Anal 10, originating opposite to fourth 

 dorsal ray. Pectoral ^ length of head. Ventrals equally 

 distant from centre of eye and base of caudal. Scales 82 

 (16 in a transverse series) ; lateral line reduced to a few 

 scales. Pale brown above, darker on the middle of the back ; 

 a dark grey lateral band, narrower on the head and passing 

 through the eye, edged with black above on the body and 

 both above and below on the head ; white beneath ; fins 

 white, with two black spots on the pectorals and one on the 

 ventrals, dorsal, and anal ; caudal with a black median streak 

 and two oblique ones on each lobe, converging behind. 



Total length 210 millim. 



A single specimen from Manaos, collected by Mr. Antony, 



