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PATAGONIAN EXPEDITIONS I ZOOLOGY. 



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: Upper courses of all streams 



of Guiana. 

 A2. Pygocentrus piraya (Cuvier). 



Serrasalmo paranha Agassiz ; f 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 (Giinther). 



Habitat: British Guiana to Para. 

 AS. Pygocentrus altus Gill. 



Habitat: Maranon. 

 AT6. Pygocentrus natter eri (Kner). 



Habitat: La Plata Basin; ? Orinoco. 



7. Pygocentrus bilineatus Eigenmann. 



Habitat: North Western Guiana. 



8. Pygocentrus ternetzi Steindachner. 



Habitat: Rio Paraguay. 

 A9- Pygocentrus calmoni Steindachner. 



Habitat: Rio Para. 

 Aio. Pygocentrus striolatus Steindachner. 



Habitat: Para. 



SERRASALMO Lacepede. 

 Type : Salmo rhombeus Linnaeus. 

 Range: Orinoco to Guianas, south to 

 the Rio das Velhas and Paraguay 

 and Bolivia. 

 A I. Serrasalmo elongatus 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 brandtii Liitken. 



Habitat: Rio San Francisco. 

 AS. Serrasalmo gymnogenys Giinther. 

 Habitat: Amazon and Paraguay. 

 A6. Serrasalmo iridopsis Cope. 



Habitat: Ambyiacu. 

 A;. Serrasalmo cesopus Cope. 



Habitat: Solimoens and Maranon. 

 A8. Serrasalmo maculatus Kner. 



Pygocentrus melanurus Heckel ; Pygo- 

 centrus nigricans Heckel. 

 Habitat: Amazons and Bolivia. 

 Ag. Serrasalmo spilopleura Kner. 



f Serrasalmo aureus Agassiz ; Pygo- 

 centrus dulcis Heckel. 

 Habitat: Guianas to Paraguay and 



Bolivia. 



Aio. Serrasalmo humeralis 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 paraensis Steindachner. 

 Habitat: Rio Para. 





Subfamily MYLIN^E. 



MYLESINUS Cuvier & Valenciennes. 



Type : Mylesinus schomburgkii Cuvier 

 & Valenciennes. 



Range that of the single species. 

 I. Mylesinus schomburgkii Cuvier & Valen- 

 ciennes. 



Habitat: Guiana; Rio Vaupes. 



CATOPRION Miiller & Troschel. 



Type: Serrasalmo mento Cuvier. 

 Range that of the single species. 

 Al. Catoprion mento (Cuvier). 



