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PATAGONIAN EXPEDITIONS: ZOOLOGY. 



A 1 5. Myleus orbicularis Steindachner. 



Habitat: Santarem. 

 1 6. Myleus orinocensis Steindachner. 



Habitat: Orinoco. 



COLOSSOMA Eigenmann. 



Waiteina and Reganina Fowler. 

 Type : Myletes oculus Cope. 

 Range : Amazon and La Plata Basins. 

 Not in southeastern coastwise 

 streams. 

 Ai. Colossoma oculus (Cope). 



Habitat: Ambyiacu. 

 A.2. Colossoma nigripinnis (Cope). 



Habitat: Amazons. 

 3. Colossoma mitrei (Berg). 



Habitat: Parana. 

 A4. Colossoma bidens (Agassiz). 



Habitat: Amazons. 



5. Colossoma orbignyanum (Cuvier & Va- 



lenciennes). 

 Habitat: La Plata Basin. 



6. Colossoma herniarium (Cope). 



Habitat: Peruvian Amazon. 



MYLOSOMA Eigenmann. 



Type : Myletes albiscopus Cope. 

 Range: Guiana and Orinoco to the La 

 Plata Basin; not in the coastwise 

 streams of southeastern Brazil. 

 Ai. Mylosoma aureum (Spix). 

 Myletes auriventris Cuvier. 

 Habitat: Orinoco to La Plata Basin. 

 A2. Mylosoma albiscopus (Cope). 

 Habitat: Ambyiacu. 



Subfamily CYNODONTIN^E. 



RHAPHIODON Agassiz. 

 Type : Rhaphiodon vulpinus Spix. 

 Range that of the single species. 

 A I. Rhaphiodon vulpinus Spix. 

 Habitat: Orinoco to La Plata. 



CYNODON Spix. 

 Type : Cynodon gibbus Spix. 

 Range that of the single species. 

 Ai. Cynodon gibbus Spix. 



Habitat : Amazon to Rio Mamore. 



HYDROLYCUS Miiller & Troschel. 



Type : Hydrocyon scomberoides Cuvier. 



Range : Amazons south to the Araguay 

 and north in the Guianas to Orinoco. 

 Ai. Hydrolycus scomberoides (Cuvier). 



Habitat: Orinoco and Guianas; Ama- 

 zons and south to Araguay. 

 A2. Hydrolycus copei Gill. 



Habitat: Maranon. 

 A3. Hydrolycus pectoralis Giinther. 



Habitat: Maranon. 



Subfamily CHARACIN.E. 



ASIPHONICHTHYS Cope. 



Type : Asiphonichthys stenopterus Cope. 

 Range that of the single species. 

 I. Asiphonichthys stenopterus Cope. 

 Habitat: Jacuhy. 



CHARAX Scopoli. 



Epicyrtus Miiller & Troschel ; A nacyrtus 

 Giinther ; Cynopotamus C. & V. ; 

 Cyrtocharax Fowler. 

 Type: Salmo gibbosus Linnaeus. 



Range : Guiana ; Amazons ; Paraguay. 

 A I . Char ax tectijer ( Cope) . 



C. sanguineus Cope. 



Habitat : Ecuador. 

 A2. Charax gibbosa (Linnaeus). 



Epicyrtus macrolepis Kner. 



Habitat: Guianas; Amazons and Para- 

 guay. 

 A3. Charax pauciradiata (Giinther). 



Habitat: Amazons. 

 A4. Charax limasquamis (Cope). 



Habitat: Maranon. 



