﻿KiHTHYOLOGlCAL RECONNAISSANCE OF COLOMBIA 



23 



Type, 174 mm.. CM. No. 4808, Cartago. 



Paratypes, eleven specimens, Cartago, CM. No. 4809 a-c ; I.U.M. No. 



12672 a-cl. 



ParatjT^s, three specimens, Paila. CM. No. 4810 a-b ; I.U.M. No. 



12673 a. 



Paratypes, eleven specimens, Cauca river at Cali, CM. No. 4811 a-c; 

 I.U.M. No. 12674 a-c. 



GEPHYROCHARAX gen. nov. 



Between Paragoniates and Hysteronotus, thns allying the Teragonop- 

 terinae with the Agoniatinae. 



Premaxillary teeth in two distinct series, tive teeth in the inner series. 

 Second suborbital covering the entire cheek. Caudal without glandular 

 scales, the lower caudal fulcra free and forming a peculiar spur in the 

 male. Adipose fin present. Origin of dorsal nearer tO' caudal than the 

 eye, considerably behind the vertical from origin of anal, pectorals large, 

 overlapping the ventrals. 



E^^idently allied to Hysteronotus, from which it differs in the denti- 

 tion, and the peculiar caudal. Represented by three species, two from 

 the Atlantic, the other from the Pacific side of the western Cordilleras. 



Type, GephyrocJiarax chocoensis Eigenmann. 



24. Gephyrocharax chocoensis sp. nov. 



Plead 4.66-5; depth 3-3.25; D. 10; A. 30; scales 6-42-4.5; eye .75 in 

 snout, 3 in head, 1.2 in interorbital. 



Compressed ; ventral profile regularly arched ; dorsal profile to dorsal 

 much more gently arched, slightlj' depressed over the eye. Predorsal area 

 rounded, having about seventeen scales not forming a regular series ; pre- 

 ventral surface narrowly rounded, postventral trenchant ; breast broad, 

 but with median ridge. Frontals meeting in a sinuous suture; no frontal 

 fontanel ; parietal fontanel rhomboidal as in Hysteronotus. Third suborb- 

 ital covering entire cheek. Maxillary-premaxillary border angulate, about 

 2J in length of head; maxillary with a single tooth; premaxillary with an 

 outer series of four and an imier of five teeth ; dentary with four or five 

 large teeth, followed by abruptly minute teeth. Gill-rakers 4 11, all 

 very short, those of the upper arch mere points. 



Dorsal rounded or truncate, the highest ray extending little beyond 

 tip of penultimate, not reaching the adipose; caudal forked, the lobes 

 about equal, 3J in the length, lower fulcra in the male separate from the 

 rest of the lower caudal lobe, stiff, lancet-shaped, anal beginning far in 

 advance of the dorsal, the anterior rays high, but the fin not falcate, the 

 anal very slightly emarginate. Ventrals small, not reaching anal ; pectorals 

 large, falcate, extending beyond origin of ventrals, 4 in the length. 



Scales cycloid, those above lateral line and above posterior half of 

 anal in regular, longitudinal series, those over the abdomen and above 

 anal anteriorly in decurrent series ; each scale with several divergent 

 radii; axillary scale w^ell developed; caudal sheath ((^) unique, two- 

 pronged, at base of lower caudal lobe, the upper prong longer and broader. 



