302 Field Museum of Natural History — ZoGlogy, Vol. X. 



31. Genus Luciocharax Steindachner. 



Ctenolucius Gill, Proc. Ac. Nat. Sci. Phila., 1861, 8 (no type designated). 

 Luciocharax Steindachner, Denkschr. K. Ak. Wiss. Wien, XXXIX, 



1878, 67 (type Luciocharax insculptus Steindachner). 

 Belonocharax Fowler, Proc. Ac. Nat. Sci. Phila., 1906, 464 (type Belono- 



charax beani Fowler). 



Body long, not much compressed; ventral surface rounded; jaws 

 much produced; teeth present on both jaws and maxillary, in a single 

 series, directed backward, a small patch present on roof of mouth near 

 tip of upper jaw; lateral line incomplete; scales large, pectinate; dorsal 

 and anal inserted far backward. 



46. Luciocharax beani (Fowler). 



Belonocharax beani Fowler, Proc. Ac. Nat. Sci. Phila., 1906, 464 (Rio 



Truando, tributary of the Rio Atrato). 

 Ctenolucius hujeta (non Valenciennes) Bean, Proc. U. S. Nat. Mus., 



XXXIII, 1908, 701 (Rio Truando). 

 Luciocharax striatus Boulenger, Ann. & Mag. Nat. Hist., Ser. 8, VII, 



1 9 1 1 , 212 (Boca de Calima, Choco) . 



Head 2.5 to 3.25; depth 5.9 to 9.1; D. 10; A. 10 or 11; scales 

 47 to 50. 



Body long, not much compressed; the back not elevated; head long, 

 flat above; snout long, slender, beak-like, 2 to 2.5 in head; eye 7.7 to 10; 

 interorbital 4.85 to 7.7; mouth large, slightly oblique; upper jaw pro- 

 jecting, ending in a fleshy point; lower lip developed into a flap on each 

 side; maxillary slipping under suborbital, reaching opposite posterior 

 margin of eye; teeth in the jaws sharply pointed, more or less lance- 

 shaped, in a single series, all directed backward; the anterior ones in 

 upper jaw somewhat enlarged and in advance of lower jaw; teeth in 

 sides of jaws and maxillary small and very nimierous; roof of mouth 

 near tip of upper jaw with a small patch of conic teeth; gill-rakers 

 poorly developed, 7 more or less developed on lower limb of first arch; 

 lateral line present on 22 to 32 scales (in one specimen on only 16 scales); 

 scales strongly striate and ctenoid, with pores; dorsal fin small, its 

 origin half as far from base of caudal as from margin of preopercle; 

 adipose fin well developed, a little nearer base of upper caudal rays than 

 base of last dorsal ray; caudal fin forked, the lower lobe the larger; anal 

 fin small, its origin under posterior rays of dorsal; ventral fins short, in- 

 serted midway between base of pectorals and origin of anal; pectoral 

 fins equal to or slightly shorter than postorbital part of head, inserted 

 midway between tip of lower jaw and base of ventrals. 



