the San Juan River, Colombia. 4G5 



equidistant from end of snout and base of caudal, longest 

 ray as lung as head ; free edge straight. Anal 29-32 ; 

 origin below or just behind end of dorsal ; a Scaly sheath at 

 its base. Pectoral extending to pelvies, which reach' vent. 

 Caudal scaly at base only. Olivaceous ; a bluish-silvery 

 Lateral band ending iu a blackish caudal spot. 



Ten specimens, 45 to 90 mm. in total length, from the 

 Rio Condoto (Spurreli) and the Rio San Juan and Rio 

 Tarn an a (Palmer). 



This species has a larger eye and narrower suborbitals 

 than the preceding and usually more scales in a transverse 

 series. Both have the dentition characteristic of the genus, 

 the pnemaxillaries with an inner series of -1 teeth on each 

 side and an outer series of 5, the second and fourth internal 

 to the others. 



9. Bryconamericus scleroparius, Regan. 

 R. San Juan {Pal/tier). 



10. Hyphessobrycon condotensis, sp. n. 



Depth of body 2£ to 2| in length, length of head 3jfc. 



Snout much shorter than diameter of eye, which is 2j in 

 length of head ; interorbital width 3. Maxillary extending 

 to below anterior \ of eye ; a naked space between second 

 suborbital and praeopercle. 33 to 35 scales in a longitudinal 

 series, 10 to 15 in lateral line, 7 or 8 from origin of dorsal 

 to lateral line, 5 or 6 thence to base of pelvics. Dorsal 11 ; 

 origin nearly equidistant from end of snout and base of 

 caudal; longest ray as long as head. Anal 28-30 ; origiu 

 below posterior part of dorsal ; a distinct scaly sheath at 

 base of anterior rays. Olivaceous ; a dusky lateral stripe 

 posteriorly ; a vertically expanded dark humeral spot, a 

 second dark spot behind it ; no caudal spot ; dorsal immacu- 

 late ; base of anal and caudal lobes bright orange. 



Several specimens, 30-10 mm. iu total length, from the 

 Rio Condoto (Spurreli) and the Rio San Juan (Palmer). 



11. Astyanax ameus, Gunth. 

 R. San Juan (Palmer). 



12. Nematobrycon palmeri. Eigcnm. 

 R. Condoto (Palmer, Spurreli) ; R. San Juan (Palmer). 



