Edentulous Genera of Curimatince. 413 



Scales small on back, becoming larger towards the breast, where they 

 are several times as large as on the back. Scales of the breast pecti- 

 nate, the rest more or less ciliate. Caudal naked. 



Air-bladder extending to origin of anal. 



Origin of dorsal about equidistant between tip of snout and base of 

 upper caudal fulcra, in a few specimens nearer the caudal; the highest 

 ray shorter than the head. Caudal broad, emarginate. Anal short, 

 emarginate, the tip of the longest ray reaching the tip of the last ray. 

 Pectorals reaching scarcely to ventrals, ventrals not to vent. Origin 

 of ventrals nearer base of caudal than tip of snout. Plumbeous above, 

 gradually becoming lighter below. A dusky area on the base of the 

 caudal at end of lateral line. 



Head 3i-3^; depth 2i-2i. D. 12-13; A. 10-11. Scales 14 to 16-53 to 

 58^10 or 11. 



2. PSECTROG^STER AMAZONICA s^, nov. ? 



? Anodus ciliatus M. and Tr. 



Habitat, Amazons. 



Many specimens: Teffe; lea; Tabatinga; Obidos; Fonteboa; Lago 

 Alexo; Jutahy; Tonantins; Santarem; Hyavary; Curupira. 



This specie^ agrees in almost all respects with Psectrogaster rliomhoi- 

 des. 



Profile very little, if at all, depressed at the occiput. 



Air-bladder extending to posterior end of anal. 



Origin of dorsal fin about equidistant from tip of snout and from tip 

 of the adipose fin. Origin of ventrals nearer to tip of snout than to 

 base of caudal. 



Head about 3f ; depth about 2^. D. 12-13; A. 11-12. Scales 12 or 13 

 -49 to 56-9. 



3. PSECTROGASTER CIIilATA. 



Anodus ciliatus M. and Tr., '45a, 25, pi. IV., fig. 4 (Essequibo); id. '48a, 



633 (Lake Amucu). 

 Curimatus ciliatus Castelnau, '55a, 58 (Amazon); Kner, '59a, 143 

 (Ypanema; Guapore); Gthr. '64, 292 (copied). 



Habitat, Amazon and its tributaries; Guiana. Rare. 



Six specimens from Coary may be referred here. The male of this 

 species (?) cannot be told from specimens of amazonica. The female is 

 strikingly deeper than amazonica. The largest specimen measures 

 .18 m. 



Profile convex. Origin of dorsal in females about equidistant from 

 tip of snout and base of upper caudal fulcra. Origin of ventrals about 

 equidistant from tip of snout and base of caudal— considerably nearer 

 base of caudal in largest specimen. Depth 2f ^ -2| ? . D. 12-13; A. 11- 

 12. Scales 12-56-9 or 10. 



