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INDIANA UNIVERSITY STUDIES 



Head 4-4.5; depth 2.9-3.25; D. 10; A. 25-28; scales G-37 to 40-5 or 6 

 (nsnally 39 scales in the lateral line) ; eye 3-3.5 in the head, slightly less 

 than interorbital. Base of anal 3-3.5 in the length. 



Compressed, dorsal and ventral outlines nearly symmetrically tind 

 equally curved, depth of caudal peduncle equal or not quite equal to its 

 length, 1.7-2 in the head. Preventral region rounded, without a regular 

 median series of scales ; predorsal area narrow with a median series of 

 11-13 scales. 



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

 dorsal, bordered by three scales on the side; frontal fontanel considerably 

 shorter than the parietal. Second suborbital leaving a very narrow border 

 behind, and at times a small angle below its anterior edge naked ; max- 

 illary a little more than 3 in the head, scarcely longer than the snout. 

 Usually four, sometimes five, scales in the front series of the premaxillary : 

 four graduated teeth in a crescent and numerous smaller teeth on the 

 sides of the lower jaw: maxillary with three teeth. 



Scales as in pcruauus. 



Ori.i;hi of dorsal a1)out eriuidistant from snout and caudal; middle 

 caudal rays dusky. 



Otherwise as in peruiuiiis. 



13. Bryconamericus tolimae sp no v. 



Type, lis mm. Ibague. CM. No. 5057. 



Paratypes, 15, 50-115 mm. Ibague. CM. No. 5058. I.U. No. 12SS0. 



Head 4.2-4.6; depth 3-3.5; D. 10; A. 21-25; scales 6 or 7-41 to 43-5 

 or 6; eye 3.5-3.75 in the head. 1.3-1.5 in interorbital; depth of caudal 

 peduncle 2.5 in the greatest depth : length of caudal peduncle about half 

 the depth of the body. 



Elongate, rather heavy at the shoulders. Preventral area rounded, 

 without a median series of scales, post-ventral area narrowly rounded. 

 Predorsal area narrowly rounded, with about 14 scales, the 4 to 6 

 nearest the occipital process in a median series, behind these there is no 

 regular median series, the scales of one side or the other overlapping the 

 median line. Occipital process short, about one-eighth of the distance from 

 its base to the dorsal ; head broad, convex, the snout rounded ; the 

 mouth terminal, the maxillary border making an angle with the premax- 

 illary border ; maxillary not quite reaching end of the first suborbital, 

 equal to the eye in length ; greatest width of second suborbital equal to 

 the eye in tlie lai'gesit. narrower in the smaller. Usually four or five 

 teeth in the front row of the premaxillary arranged in a straight line; 

 four teeth in the inner row of the premaxillary: maxillary with six to 

 seven teeth, fewer in young, arranged along half the free margin of the 

 maxillary. The maxillary teeth vary considerably in the extent of the 

 border of the maxillary over which they are distributed. In the younger 

 they may be restricted to n_ear the u])per angle. Mandibulary teeth nearly 

 regularly graduate from the first to the last. 



Origin of dorsal slightly nearer tip of snout than base of caudal, 

 rounded or truncate, the longest ray scarcely reaching beyond tip of 

 penultimate, 3.75 in the length : caudal lobes short, about equal to the 



