Edentulous Genera of Curimatince. 427 



emarginate, the longest ray reaching the caudal. Ventrals extending 

 about to vent, pectorals not to ventrals. 



Silvery below, light brown above. A blackish spot in front of the 

 dorsal, another behind the occipital process ; a white lateral band. 



Head 4-4i; depth 3|-3f. D. 12-13; A. 10-11. Scales 11-64 to 67-9. 



Ten specimens from Manacapuru and one from Hyavary have the 

 scales 10-60 to 64-8. 



27. CURIWIATUS VITTATUS. 



Roncador. 



Ourimatus vittatus Kner, '59a, 139, pi. I.,^fig. 1 (Guapore; Rio Negro); 

 Gthr., '64a, 393 (copied). 



Habitat, Amazon, Solimoens and tributaries. 



Two specimens, .15-34 m. Lake Hyanuary; Teffe. 



Compressed, the back somewhat elevated, making an angle at the 

 first dorsal ray. The back rounded, without keels. Preventral region 

 flat, with lateral keels; postventral region with a strong median and 

 indistinct lateral keels. 



Scales thin, persistent, entire or crenate. 



Profile somewhat depressed at the occiput. Mouth inferior. Eye 1 

 in snout, 3^ in head, lf-l|- in interorbital. 



Anterior dorsal rays high, about equal to head in length. Caudal 

 broad, the rays many times branched. Anal emarginate, the longest 

 ray not reaching tip of last ray. Pectorals extending to the ventrals in 

 smaller specimens, much shorter in larger; ventrals to vent in smaller 

 specimen. 



Larger specimen silvery white, with indistinct cross-bars on the back. 

 Smaller specimen iridescent peacock-blue; back darker, with blackish 

 cross-bands; a dusky band along the lateral line. 



Head 3i-3|; depth 2|-3. D. 13; A. 13. Scales 11-56-6 or 7. 



28. CURIWIATUS OCELLiATUS sp. nov. 



Types, three specimens, .18-.24 m. Xingu; Senhor Vinhas. 



Elongate, compressed fusiform. Dorsal and ventral outlines regu- 

 larly curved. Back and belly rounded. Predorsal line scaled. 



Head subconical, the mouth terminal. Adipose lids leaving but a 

 narrow vertical slit over the pupil. Eye 1^ in snout, 4^ in the head, 3 

 in the interorbital. 



Scales of about equal size, their margins entire. 



Air-bladder scarcely reaching the anal. 



Origin of dorsal little nearer to tip of snout than to base of caudal. 



Caudal widely forked, the outer lobes longer than the head, the mid- 

 dle rays less than an orbital diameter in length. Anal emarginate. 

 Pectorals and ventrals of about equal length, equal to snout and orbit. 



