1914. 



NATURAL SCIENCES OF PHILADELPHIA. 



263 



in its more slender body, more anal rays, longer maxillary barbels, 

 and the coloration. Rhamdella eriarcha (Eigenmann and Eigen- 

 mann)'^ another related species agrees in the slender body and 

 coloration, though differs in its short maxillary barbels and fewer 

 gill-rakers. Rhamdella ignohiUs Steindachner-" has maxillary barbels 

 reaching only to the dorsal end basally, larger head and deeper 

 body, though its color is suggestive. 

 (JsTrro?, slender; (7w/7.«, body.) 



Pimelodella cristata (Miiller and Troschel). 



One example 140 mm. 



Pimelodella gracile (Valenciennes). Fig. 13. 



One example 155 mm. Not previously recorded from British 

 Guiana. 



Fig. 13. — Pimelodella gracile (Valenciennes). 

 Pimelodus clarias (Bloch). 



One example 220 mm. ]\Iaxillary barbels reach caudal base. 



Hemisorubim platyrhynchos (Valenciennes). 



One example 260 mm. 



Sorubim lima (Schneider). 



One example 270 mm. Also an addition to the fauna of British 

 Guiana. 



DORADIN.E. 



Doras costatus (Linnaeus). 



Two examples 180 mm. and 270 mm. 



^' Rhamdia eriarcha Eigenmann and Eigenmann, Proc. Cal. Acad. Sci., (2) I, 

 1888, p. 129. Rio Grande do Sul. 

 ^^Sitz. Ak. Wiss. Wien, CXVI, I, 1907, p. 4S4. Rio Cubatao, Brazil. 



