﻿ICHTHYOLOGICAL RECONNAISSANCE OF COLOMBIA 



17 



to end of adipose (to caudal in some smaller examples) ; the mental barbels 

 are disposed as two pairs, the outer extending past middle of ventrals (to 

 base of last anal ray in some younger, the anterior pair past middle of 

 pectorals (to ventrals in some younger). 



First dorsal ray very high, greater than head and humeral process, 

 the fin thence rapidly lower, the last ray about 4 in the first ; adipose 

 beginning at or before tip of last dorsal ray, reaching its maximum height 

 above tips of ventrals. its base 2.-5-2.6 in the length, its height nearly equal 

 to two orbital diameters ; caudal deeply forked, upper lobe the longer, 3.5 

 in the length ; anal short, emarginate. tip of first branched ray extending 

 past tip of last ray, equal to snout and eye. Ventrals very large, the outer 

 rays very heavy, longer than head ; pectorals broad, falcate, reaching 

 ventrals in the young, not in the old. 



Plumbeous, yellow in life. 



Type, 202 mm.. Girardot. CM. No. iS22. 



Paratypes, many specimens, Girardot, CM. No. 4822 a-j : I.U.M. No. 

 12681 a-j. 



Paratypes, many specimens, Apulo. I.U.M. No. 12682 a-z. 



15. Hemicetopsis othonops sp. nov. 

 Allied to plumdeus. 



Head 4.5 ; depth 4-5.5 ; D. 7 ; A. 26 ; Y. 6 or 7 ; eye 6.5. 



Subcylindrical, compressed backward. Mouth subtermiual. the snout 

 projecting; premaxillary with a series of small, conical teeth; mandible 

 with two or three irregular series of similar teeth in front, a single regular 

 series on sides; vomer with a single series of about 24 teeth, somewhat 

 heavier than those of the jaws, conical. Gill-opening large, two-fifths of 

 it above the upper ray of pectoral ; distance between posterior nares about 

 1.5 in distance between the anterior. Pectoral pore large ; lateral line sim- 

 ple, straight. Distance of dorsal from tip of snout a little more than 3 

 in the lengtJi ; first dorsal ray distinctly higher than second, prolonged in a 

 filament, the last ray less than half as high as second. Caudal forked, 

 less than one-fourth of the length ; anal rays gradually decreasing back- 

 ward ; inner ventral ray adnate for most of its length ; filament of first 

 pectoral ray nearly, or quite, reaching ventrals. 



Plumbeous above, silvery on sides and below. 



Type, 120 mm. Girardot, CM. No. 4830. 



Paratypes, twenty-seven specimens from Girardot, CM. No. 4831 a-j ; 

 I.U.M. No. 12684 a-j. 



Paratypes, thirty-eight specimens, Apulo, I.U.M. No. 12685 a-j. 



Paratypes, three specimens, Gauca near Call. CM. No. 4832 a-b ; I.U.M. 

 No. 12686 a. 



The Cetopsinse have hitherto not been recorded from the Magdalena 

 basin. 



