s 



INDIANA UNIVERSITY STUDIES 



Head 4.25; depth 3 1/7; D. 11; A. 27; scales 6-88-39-6; eye 11/7-1 1/3 

 ill interorbital 3-3.33 in the head. Depth of caudal peduncle eqnals its 

 length. 



; Very similar lo >:i!uus from the Chota valley which lacks the caudai 

 spot. 



Hemibrycon colombianus Eigenmann, sp. nov. 



5470a C. M. Type, 106 mm. 13162 I. U. M.. Paratype 106 mm. Rio San Gil, 

 8antander, Colombia. 



5471a C. M. 13163 I. V. M.. Paratypes 2, larger 79 mm. Rio Piedras, San- 

 ta nder. 



5472a C. M. 13164 T. U. M., Paratypes 2, largtr 63 mm. Quebrada Deoca 

 Monte. Santander. 



5473a-e. C. M. 13165 I. U. M.. Paratypes 10. largest 55 mm, Qnebradi 

 M a r a r a r i . Santa nder . 



Hea.l 4.33-4.5; depth 3.2 3.5: D. 10; A. 24 or 25; scales 8 or 9-47 t) 

 53-7 or 8 : eye eqnals snont. 3.5 in the head. 1.25-1.3 > in interorbital ; 

 de])tli of candal pedniicle but little greater than its 'eiigth. 1.66 in the length 

 of the head. 



liobnst. rot greatly compressed, ventral areas ronnded. preventral area 

 without a distinct median series of scales ; predorsal area ronr-ded with 

 about 17 rows of scales, not in a median series ; interorbital convex, about 

 one-eighth in the distance between its base and the dorsal ; parietal font- 

 anel not quite twice as long as the frontal in the adult; second suborbital 

 as wide as the eye. its margin very convex, in contact with the preopercle 

 both below and 1)eliiiid ; maxillary about as long as eye, not quite reaching 

 the suture betAveen the first and second suborbitals ; maxillary-preniaxil- 

 lary border equal to snout and half the eye; four teeth in each row of the 

 premaxillary. the outer series slightly curved; about seven heavy teeth 

 occupying most of the edge of the maxillary, the anterior teeth tricuspid, the 

 posteiicr triargulaT or conical; four large quinque cuspid teeth in the 

 mandible, the middle point much the heavier and larger ; abruptly small 

 ones on the sides. 



Scales small, regularly arranged, the series not deflected toward the 

 anal; numercus nearly parallel radials : an anal sheath of several series 

 of teeth ; base of caudal with large scales ; a well developed axillary scale ; 

 lateral line decurrent to the tenth scale, thence nearly straight. 



Origin of the dorsal but little nearer the snou.t than the base of the ' 

 caudal; its height a little less lhan the length of the head; adipose well 

 developed ; caudai lobes, including the scaled j'ortioii, about 3.5 in the head ; 

 anal low. its margin nearly straight, its origin under last dorsal ray, but 

 little nearer opercle than caudal; ventrals small, not reaching anal by one 

 to three scales ; pectorals not reaching ventrals by one to three scales. 



An obscure vertical humeral spot crossing the lateral line between the 

 fourth to sixth scale; middle caudal rays dark. 



Very largely described from the two largest specimens. 



Piabira artalis Eigenmann, sp nov. 

 Mouth as in (^reagrutus. anal long. 



