the San Juan River, Colombia. 4G3 



3| to 1 \ thence to base of pelvics. Dorsal 11-12 ; origin 

 behind base of pelvics : longest ray about -| length of head. 

 Anal 29-32 j origin below last rays of dorsal ; edge straight 

 or slightly emarginate. Pectoral not or barely reaching 

 pelvics, which sometimes reach anal. Silvery ; a black spot 

 at base of caudal; fins dusky, with paler edges. 



Nine specimens, np to 220 mm. in total length, from the 

 llio Condoto (Spurrell) and Western Ecuador (Rosenberg). 



B. moorei } Steind., from the Magdalena Kiver, is near this 

 species, but has more numerous scales. B. atricaudatus, 

 Kner (B. scapula/ is, Fowler), from W. Ecuador, differs in 

 the same respect and also in the larger head. 



5. Creagrutus leuciscus, sp. n. 



Depth of body 3 to 3^ in the length, length of head 3| 

 to 4. Snout shorter than diameter of eye, which is 3 in 

 length of head and nearly equal to interorbital width. 

 Maxillary extending to below anterior \ of eye ; lower jaw 

 the shorter. 10 gill-rakers on lower part of anterior arch. 

 Lateral line complete, of 35 or 36 scales ; 4 or 4i from 

 origin of dorsal tin to lateral line, 3 thence to base of pelvic. 

 Dorsal 10 ; origin above insertion of pelvics, nearer end of 

 snout than base of caudal. Anal 14-15, emarginate. Pec- 

 toral not quite reaching pelvics, which extend to vent or 

 origin of anal. Olivaceous ; a bluish-silvery lateral band ; 

 no humeral or caudal spots ; fins immaculate. 



Three specimens, 55 to 80 mm. in total leugth, from the 

 K. Lisa {Palmer) and the K. Condoto {Spurrell). 



Xenurociiarax, gen. nov. 



Near Deuterodon, differing in that a scaly flap extends on 

 the caudal tin, covering a pocket opening downwards, ending 

 in a huge triangular scale carrying the lateral line nearly to 

 the end of the middle caudal rays, and with its lower half 

 marked with numerous vertical striations. 



G. Xenurociiarax spurreUii, sp. u. 



Depth of body 3^ in the length, length of head \\. 

 Snout shorter than diameter of eye, which is 3 m length of 

 head anil equal to interorbital width. Teeth of outer series 

 of pnemaxillaries tricuspid, with weak lateral cusps, 2 teeth 

 on one side. '■) on the other ; inner pnemaxdiary teeth with 

 3 strong cusps and some times an additional pair of eusps, 4 

 teeth on each side ; anterior mandibulary teeth similar to 



