﻿ICHTHYOLOGICAL RECONNAISSANCE OF COLOMBIA 



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length of the head; origin of anal below vertical from base of last dorsal 

 ray. 



Origin of ventrals equidistant from tip ot snout and middle of last 

 anal ray ; ventrals short, reaching anus ; pectorals not reaching ventrals 

 by about three scales. 



Scales regularly imbricate, not notably smaller over the anal muscula- 

 ture and the rows not deflected toward the anal ; caudal naked but the 

 lobes with a. rather broad basal sheath of scales not attached to the rays; 

 anal with a sheath of a few scales along the bases of the anterior rays, 

 the scales not attached to the rays; axillary scale short; each scale with 

 many (as many as 20 in some cases) radial strife. Lateral line complete, 

 but little decnrved. 



A dull humeral band crossing the third and fourth scales of the lateral 

 line; a band on caudal peduncle, extending to end of middle rays. 



A Bryconamericus dentatus sp nov. 

 Type, 98 mm. Piedra Moler. CM. No. 5054a. 



Paratypes, 16, 40-96 nun. Piedra Moler. CM. No. 5054 b-h ; I.U.M. 

 No. 12828. 



Paratypes, 20, 40-118 mm. Paila. CM. No. 5053 a-e ; I.U.M. No. 

 12827. 



Paratypes, 2, 45 and 90. Cauca at Call. CM. No. 5074; I.U.M. No. 

 12848. 



Head 4-4.5; depth 3.2-3.4; D. 10; A. 30-34; scales 7 or 8-45 to 48-5 

 or 6 ; eye 3 in head, equal to the interorbital ; depth of caudal peduncle 

 less than its length. 2 or less in the length of the head, 2.75-3 in the 

 depth. 



Compressed, sleiTder. dorsal and ventral profiles equally and evenly 

 curved; preventral area narrow, narrowly convex between the pectorals, 

 no regular median series of scales ; predorsal area with about 13 scales 

 not in a regular series ; occipital process about equal to one-seventh of 

 the distance from its base to the dorsal, bordered by three scales on each 

 side; interorbital convex, smooth; snout pointed, the lower jaw slightly 

 the shorter ; second suborbital leaving a narrow naked border behind, its 

 greatest width in the largest specimens three-fourths as long as the eye; 

 maxillary almost or quite reaching to the end of the first suborbital, equal 

 to the eye in length, premaxillary-maxillary border without a distinct 

 angle. Four teeth in the inner series of the premaxillary ; outer row of 

 l)remaxillary teeth four to six, very variable in position, the first and 

 last usually quite evident, in front of the lower lip when the mouth is 

 closed (the first is quite prominent and well formed in the Piedra Moler 

 specimens). Sometimes the teeth are in a curve, sometimes they are all 

 in a straight line, sometimes alternate teeth are withdrawn from the line, 

 s\3metimes the middle one is withdrawn, etc. ; maxillary with from 3-9 

 teeth, the anterior ones 3-5 pointed, the last one freciuently remote from 

 the others, conical ; the teeth sometimes extending over half the margin 

 of the maxillary, rarely over more than one-half. Mandible with five 

 larger teeth in a series and about ten graduated ones on the side, the 

 break between the fifth and sixth not very pronounced. 



