﻿ICHTHYOLOGICAL RECOXNAISSANCE OF COLOMBIA 



13 



mm. Scales 9-44-G : depth of caiulal ])ediui(:-le equal to its length; depth 

 3; A. 31; maxillary teeth 0. on ahont half the free margin; lateral 

 teeth of the mandible suddenly minute. 



15. decurrens Eigenmann. 



mmm. Scales ? ; A. 26-29 ; maxillary teeth usually 7-10, usually extending 

 over more than half the free margin ; lateral teeth of the man- 

 dible suddenly minute. 



16. bcquiae E genmanu. 



1. Bryconamericus converLtus sp. nov. 

 Type, about 47 mm. Soplaviento. CM. No. 5060. 



Paratyjies. 70, largest 53 mm. Sophn iento. CM. No. 5061 a-n ; I.U.M. 

 No. 12802. 



Head 4-4.33; depth 3.33-3.6; D. 9 or 10; A. 35 or 36 (rarely 33); 

 scales 7 (rarely 6) -42 to 45-5; eye 2.5-3 in head, equal to or a little 

 larger than the interorbital ; base of anal 2.6 to 2.7 in the length. 



Slender, dorsal and ventral profiles nearly equally curved, tapering 

 from the front of the long anal to the caudal peduncle, the depth of which 

 is equal to its length, about half the length of the head; preventral area 

 rounded, without distinct median series of scales ; predorsal area rounded, 

 with a median series of about fifteen scales. 



Occipital process about one-sixth of the distance from its base to the 

 dorsal, bordered by three scales on each side ; interorbital smooth, convex : 

 second suborbital leaving only a very narrow naked border behind its mar- 

 gin ; mouth terminal; maxillary equal to the eye in length, reaching to 

 the suture l^etween first and second suborbitals ; two or three teeth in 

 the outer series of the premaxillary, four in the inner ; one to three 

 minute teeth on the maxillary ; mandible narrow, with four larger teeth 

 in a crescent, the third from in front frequently the largest, the fourth 

 always small and followed by a series of suddenly minute teeth. 



Scales thin, with few radiating lines, regtilarly imbricate except from 

 above the middle of the ventrals where there are interpolated series caus- 

 ing the series below the lateral line to be deflected toward the anal ; 

 caudal naked, males with an enlarged scale overarching a pouch below the 

 middle caudal ray ; a single series of scales along the anterior anal rays ; 

 axillary scale small. 



Origin of dorsal equidistant from snout and base of middle caudal 

 rays ; origin of anal on vertical from middle dorsal rays ; ventrals reach- 

 ing anal ; pectorals to ventrals ; lower caudal fulcra prominent, continu- 

 1 ous with the margin of the anal, the tip of whose last rays reach the 

 fulcra. 



A diffuse silvery band, ^^'ell demarked above, fading out downward; 

 no humeral spot, middle caudal rays dusky; scales of the back margined 

 with dusky, Xumerous chromatophores between anal and lateral line, 

 those nearest anal arranged in rows along the interhnemals. 



