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PATAGONIAN EXPEDITIONS: 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 ; ? 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 (Gunther). 



Habitat : British Guiana to Para. 

 AS. Pygocentrus altus Gill. 



Habitat : Maranon. 

 A?6. 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. 

 AID. 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. 

 Ai. 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 Gunther. 

 Habitat: Amazon and Paraguay. 

 A 6. Serrasalmo iridopsis Cope. 



Habitat: Ambyiacu. 

 A 1 ?. Serrasalmo ozsopus Cope. 



Habitat: Solimoens and Maranon. 

 A8. Serrasalmo maculatus Kner. 



Pygocentrus melanurus Heckel ; Pygo- 

 centrus nigricans Heckel. 

 Habitat: Amazons and Bolivia. 

 Ag. Serrasalmo spilopleura Kner. 



? 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? 1 2. 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. 

 Ai. Catoprion mento (Cuvier). 



