442 



P.\TA(;ONIAN expeditions: Z0()L()(;V. 



Pygocentrus Miiller & Troschel. 

 Type: Serrasalmo piraya Cuvier. 

 Range: Orinoco to La Plata and Rio 

 das Velhas; not in coastwise streams 

 of southeastern Brazil. 

 I. Pygocentrus niger (Schomburgk). 



Habitat: Upjjer courses of all streams 

 of Guiana. 

 A2. Pygocentrus piraya (Cuvier). 



Serrasalmo paranha Agassiz ; ? Serra- 

 salmo nigricans Agassiz; Pygocen- 

 trus bidorsalis Natterer. 

 Habitat: Guiana; Amazon to Rio das 

 Velhas and Paraguay. 

 3. Pygocentrus notatus (Liitken). 



Habitat: Venezuela. 

 A4. Pygocentrus scapularis ((iiinther). 



Habitat: British Guiana to Para. 

 •'^S- Pygocentrus altus Gill. 



Habitat: Maraiion. 

 A?6. Pygocentrus nattereri (Kner). 



Habitat: La Plata Basin; f Orinoco. 



7. Pygocentrus biiiucatus Eigenmann. 



Habitat: North Western Guiana. 



8. Pygocentrus tcrnetzi Steindachner. 



Habitat: Rio Paraguay. 

 ^9- Pygocentrus calmoni Steindachner. 



Habitat: Rio Para, 

 A 10. Pygocentrus striolatus Steindachner. 



Habitat: Para. 



Serrasalmo Lacepede. 

 Type : Sahno rhombeus Linnaeus. 

 Range: Orinoco to Guianas, south to 

 the Rio das Velhas and Paraguay 

 and Bolivia. 

 A I. Serrasalmo dongatus Kner. 



Habitat: Rios Guapore and Huallaga. 

 A2. Serrasalmo gibbus Castelnau. 



Habitat: Araguay. 

 A3. Serrasalmo marginatus Valenciennes. 

 Serrasalmo humeralis Castelnau, not of 

 Cuvier & Valenciennes ; Serrasalmo 

 irritans Peters ; Serrasalmo iridopsis 

 Ulrey {non Cope). 

 Habitat: La Plata Basin; Orinoco; 

 Amazons; Rio das Velhas. 

 4. Serrasalmo braiidtii Liitken. 



Habitat: Rio San Francisco. 

 A5. Serrasalmo gymnogenys Giinther. 

 Habitat: Amazon and Paraguay. 

 A6. Serrasalmo iridopsis Cope. 



Habitat: Ambyiacu. 

 A 7. Serrasalmo ccsopus Cope. 



Habitat: Solimoens and Marafion. 

 A8. Serrasalmo maculatus Kner. 



Pygocentrus melanurus Heckel ; Pygo- 

 centrus nigricans Heckel. 

 Habitat: Amazons and Bolivia. 

 A9. Serrasalmo spilopleura Kner. 



? Serrasalmo aureus Agassiz ; Pygo- 

 centrus dulcis Heckel. 

 Habitat: Guianas to Paraguay and 

 Bolivia. 

 A 10. Serrasalmo liHiiicralis Cuvier & Va- 

 lenciennes. 

 Habitat : Amazons and Paraguay. 

 An. Serrasalmo immaculatus Cope. 



Habitat : Peruvian Amazon. 

 A?i2. Serrasalmo rhombeus (Linnaeus). 



Habitat: Guianas; Paraguay. 

 A 1 3. Serrasalmo paracusis Steindachner. 

 Habitat: Rio Para. 



Subfamily Mvi 

 Myi.esinus Cuvier & Valenciennes. 

 Type: Mylcsinus schomburgkii Cuvier 



& Valenciennes. 

 Range that of the single species. 

 Mylesinus schomburgkii Cuvier & Valen- 

 ciennes. A I 



Habitat: Guiana; Rio Vaupes. 



Catoprion Miiller & Troschel. 

 Type: Serrasalmo mento Cuvier. 

 Range that of the single species. 

 Cato prion mento (Cuvier). 



