On new Fishes in the British Museum. 215 



and will be placed at the disposal of the British Museum. 

 Dr. Wise has also sent specimens of the same species to the 

 British Museum direct, and these — thanks to the kindness of 

 Mr. E. E, Austen, whose ungrudging assistance in other 

 ways I have also to acknowledge — have been compared in 

 formulating the description of the species. 



XXIV. — Description of Two new Tetragonopterid Fishes in 

 the British Museum. By Prof. C il. ElGENMANN. 



During a visit to the British Museum to examine types of 

 Soutli-American freshwater fishes Mr. G. A. Boulenger 

 referred the following new material to me for identification. 



Nematobrycon, gen. nov. 



Caudal three-pronged, the middle two rays nearly as long 

 as, or even longer than, the outer rays, which are prolonged, 

 filiform. Lateral line incomplete; no adipose fin; pre- 

 maxillary teeth multicuspid, in two series ; maxillary with 

 large conical teeth along nearly its entire length ; caudal 

 naked. 



A Tetragonopterid genus distinguished from all other 

 genera of the subfamily by the absence of an adipose fin and 

 the filamentous three lobes of the caudal. 



Nematobrycon j^almeri, sp. n. 



Several specimens, 8-20 mm.,£rom Condoto, Rio Condoto, 

 and Novila, Rio Tamana, S.W. Colombia. Collected by 

 Mr. M. G. Palmer. British Museum. 



Head 4-2 ; depth 2-66 ; D. 10 or 11; A. 29-31. Scales 

 7 — 7 + 26 — 5. Eye 3 in head, *5-'75 in snout, about equal to 

 interorbital. 



Compressed, resembling Crenuchus and Puecilocharax in 

 general appearance and the absence of an adipose fin ; dorsal 

 and ventral protiles nearly equally arclied ; highest point of 

 dorsal profile at origin of dorsal fin ; ventral profile regularly 

 arched ; predorsal area with a median series of about seven 

 scales ; preventral area narrowly rounded ; occipital process 

 with three scales on each side, the process about one-fifth 

 as long as its distance from its base to the dorsal; frontal 

 fontanel minute ; interorbital moderately convex ; second 

 suborbital heavy, convex, in contact with the preopercle 



