402 On new Char acinid Fishes from South America. 



LII. — Descriptio7i of Two new Characinid Fishes from 

 South America. By C. Tate Regan, M.A. 



MiMAGONiATES, gen. nov. 



Body moderately elongate, compressed ; abdomen keeled, 

 but not strongly compressed to an edge. Mouth small ; teeth 

 tricuspid, in a single series ; no maxillary teeth ; palate 

 toothless. Nostrils close together. Gill-membranes not 

 united, free from the isthmus. Scales cycloid, of moderate 

 size; lateral line incomplete. Dorsal fin short, posterior in 

 position; adipose fin present ; anal fin elongate. 



Intermediate between Chirodon^ Girard, and Leptagoniates, 

 Blgr. 



Mimagoniates Barheri, sp. n. 



Depth of body 3 to 3| in the length, length of head 4 to 

 4|. Snout much shorter than eye, the duimeter of which is 

 2\ to 2| in the lengtii of head and a little less than the inter- 

 orbital width. Cleft of mouth nearly vertical ; maxillary 

 not extending to below the eye. 42 to 45 scales in a longi- 

 tudinal series ; lateral line on 4 to 8 scales only. Dorsal 10 ; 

 origin equidistant from gill-opening and base of caudal, above 

 the anterior part of the anal. Anal 34-38 ; origin equidis- 

 tant from anterior part of eye and base of caudal ; anterior 

 rays the longest, about | the length of head; fre( 

 straight or slightly concave. Pectoral extending to or 

 little beyond the base of ventral. Caudal forked. A lateral 

 band (blackish in preserved specimens) from the lower part 

 of eye to the lower lobe of caudal. An oblique dark stripe 

 on the dorsal ; anal with a dark margin. 



Hah. Arroyo Yaca, Estacion Caballero, Paraguay. 



Several specimens, the largest 40 mm. in total length, 

 collected by Dr. A. Barbero. 



Ctenocharax *, gen. nov. 



Body oblong, compressed ; abdomen rounded. Mouth 

 small ; teeth slender, subconical, in a single series ; maxillary 

 toothed ; palate toothless. Nostrils close together ; gill- 

 meinbranes not united, free from the isthmus. Scales cycloid, 

 rather large ; lateral line incomplete. Dorsal fin short, nearly 

 entirely in advance of the rather short anal ; no adipose fin. 



Related to Aphyocharax, Gthr. 



* The name Ctenocharax is given on account of the comb-like appear- 

 ance of the single aeries of teeth in the jaws. 



