216 



PROCEEDINGS OF THE ACADEMY OF 



[Apr, 



Troschel), though it differs in having the occipital process reaching 

 the dorsal plate, maxillary barbel extending to tip of ventral fin, 

 base of adipose fin 3 to 4 in length, ventral scarcely extending more 

 than half way to anal and inserted little behind vertical from last 

 dorsal ray, depth 6^ to 7, and A. 12.^ My example shows no trace 

 of a dark lateral band, this region being entirely paler. 



(Named for Peru.) 

 Pimelodella copei sp. nov. Fig. 5. 



Pimelodus laleristriga (non Miiller and Troschel) Cope, Proc. Acad. Nat. 

 Sci. Phila., 1871 (1872), p. 270. Ambyiacu River. 



Head 4|; depth 5; D. I, 6; A. iv, 8, i; P. I, 8; V. i, 5; head 

 width If in its length; head depth at occiput ly; snout 2J; eye 4|; 

 maxillary 4f; mouth width 2|; interorbital 4; dorsal spine Ij; 



Fig. 5. — Pimelodella copei Fowler. (Type.) 



first branched anal ray If; least depth of caudal peduncle 2|; pec- 

 toral 1^; ventral If. 



Body elongate, moderately compressed, deepest at dorsal origin, 

 contour rather slender, and edges all convexly rounded. Caudal 

 peduncle compressed, least depth 1| in its length. 



Head not much compressed, sides sloping gradually to form 

 broad area above, and lower surface flattened, profiles similar. 

 Snout broad, somewhat depressed, length f its greatest width. Eye 

 high, ellipsoid, midway in head length. Eyelids free, not adipose- 

 like. Mouth large, broad, transversely terminal, with short com- 

 missure, and upper jaw slightly longer. Teeth conic, in moderately 



* Eigenmann and Eigenmann, Occas. Papers Cal. Acad., I, 1890, p. 156. 



