﻿ICHTHYOLOGICAL RECONNAISSANCE OF COLOMBIA 



27 



Paratypes, 6, 34-165 mm. Cali. CM. No. 5155 a-c ; I.U.M. No. 12904. 

 Paratypes, 9, 32-110 mm. Paila. CM. No. 5156 a-e ; I.U.M. No. 12905. 

 Paratypes, 70, largest 83 mm. Piedra Moler, CM. No. 5157 a-z ; 

 I.U.M. No. 12906. 



To this species also belong 164, largest 74 mm. Cirtago. CM. No. 

 5158 a-z; I.U.M. No. 12907. 



Head 3.66-3.8; depth 3.5-3.66; D. 11 (10 in one); A. ^2, ^S, 

 scales 7 to 9-48 to 51-5 or 6 ; eye 4.5-5 in the head, snout 3.5 ; interorbital 

 2.75-3. 



This species is associated with B. atrocaudatus in the Daqua River. 

 It is readily distinguished from all other species found on the Colombia 

 and the Pacific slopes by its short anal, its scales and the color. 



The inner surface of the opercle has a large black spot and this appears 

 as a much smaller oblique spot on the upper surface of the opercle ; the 

 caudal spot is nnich less sharply defined than in atrocaudatiis and in the 

 young is much smaller ; a faint humeral bar ; formaline specimens with 

 irregular vertical lines on the sides. 



A comparative account of the species of the genus Brycon with figures 

 will appear in the final report. This species will be more fully described 

 at that time. 



Odontostille hastatus sp nov. 

 Type ^ 40 mm. Soplaviento. CM. No. 5103. 



Paratypes, 25, largest 37 mm. Bernal Creek C. M. No. 5104 a-j ; I.U.M. 

 No. 12861 a-j. 



Head 4 + ; depth 2.8-3.25; D. 11; A. most frequently 19 (18-21) ; scales 

 5.5-32 to 35-3; eye 3 in head, equal to interorbital. 



Most nearly like O. paraguaiienHis, much more slender. 



Compressed, dorsal and venti'al profiles equally arched ; preventral area 

 rounded, with about 11 scales; postventral and predorsal areas narrowly 

 rounded, the latter with a regular median series of about 10 scales ; 

 occipital process short and broad, its length one-sixth of the length from 

 its base to the dorsial, bounded by three scales on each side; frontal 

 fontanel variable, an equilateral triangle as wide as and half as long as the 

 parietal fontanel or quite minute; skull convex, snout blunt, the mouth 

 comparatively large, maxillary-premaxillary nearly as long as the eye; 

 five teeth in the premaxillary. two or three in the maxillary, four broad- 

 tipped, seven pointed teeth in the dentary in front, and with as many 

 as four similar graduated teeth on the side ; second suborbital covering 

 the entire cheek. About ten rakers on the lower arch of the gill. 



Dorsal pointed, its highest ray longer than head, reaching to within 

 two or three scales of the adipose, its origin about equidistant from tip 

 of snout and caudal; middle caudal- rays very short; a row of scales 

 reaching to the tip of the rays just below the shortest ones ; in the male 

 the rays of the lower caudal lobe with retrorse hooks similar to those of 

 the five anterior anal rays in the male ; anal short, its margin subtruncate 

 (very slightly emarginate), its rays graduate, the tip of the highest (third) 

 reaching to last fourth or to the base of the last ray; anal base 4.6 in the 

 length, its origin behind the vertical from the last dorsal ray ; origin of 

 ventrals in front of the vertical from the anterior dorsal ray about 

 reaching the anal ;, pectorals not quite reaching ventrals. 



