120 CALIFORNIA ACADEMY OF SCIENCES. 



HYPOPHTHALMID.E. 



I. Helogenes Giintlier. 



1 . Helogenes marmoratus Gunther. 



II. Hypophthalmus Spix. 

 Notophihalmus Hyrtle; Pseudohypoplithalmus Bleeker. 



2. Hypophthalmus edentatus Spix. 



Hypophthalmus marginatus, H. longiJiUs, and H. spixii Guv. & Val. 



Hypophthalmus edentulus Castelnan; Hypophthalmus Jimbriatus 



Kner; Hypophthalmus perporosus (Jope. 

 Locality: Para. 



SILUEIDtE. 



I. Callophysus Miiller & Troschel. 

 Pimelotropis Gill; Fseudocallophysus Bleeker. 



1. Callophysus macropterus (Lichtenstein). 



Pimelodus denodus Agassiz; Pimelodus insignxs Schomburgk, in part: 



plate, but not description; Pimelotropis lateralis Gill. 

 Localities: Obidos; Lake Jose Assn; Cameta; Eio Negro; Santarem; 

 Tonantins; Lake Manacapuru. 



II. PiMELODiNA Steindaclmer. 



2. Pimelodina flavipinnis Steindachner. 



3. Pimelodina nasus sp. nov. 



Type, No. 7490. Length to base of caudal .34 m. Para. Agassiz. 



This species differs from flavipinnis as follows : adipose 

 fin 2 in the length (2 J in flavipinnis) ; eye 8 in head (6) ; 

 head not compressed behind the eyes (compressed) ; great- 

 est width of head 1| in its length (3); maxillary barbels 

 reach to the end of the adipose fin (beyond base of caudal); 

 head everywhere strongly convex in a cross-section (almost 

 flat between the eyes) ; depth above ventrals 4J (SJ-Sg) ; a 

 dark humeral area, otherwise plain yellow (several rows of 

 brown spots on the upper half of the body). 



Elongate fusiform, the back compressed, trenchant; 



