438 



PATAGONIAN EXPEDITIONS I ZOOLOGY. 



Habitat: Villa Bella. 



A 1 5. Mcenkhausia xinguensis (Steindach- 

 ner). 



Habitat: Xingu. 

 A 1 6. Mcenkhausia me galops Eigenmann. 



Habitat : Gurupa td Itaituba ; Guiana. 

 A 1 7. Mcenkhausia dichraurus (Kner). 



Habitat : Paraguay Basin and Amazons. 

 A 1 8. Mcenkhausia diclirouriis intermedia 

 Eigenmann. 



Habitat : Tabatinga. 

 A 19. Mcenkhausia lepidurus (Kner). 



Habitat : Amazons to Guianas. 

 A2O. Mcenkhausia lepidurus lata Eigen- 

 mann. 



Habitat: Tapajos. 



A2i. Mccnkhaiisia lepidurus iccc Eigen- 

 mann. 



Habitat: Ic.a. 



A22. Mocnkhaiisia lepidurus gracillima Ei- 

 genmann. 



Habitat: Serpa and Villa Bella. 

 A23. Mcenkhausia collettii (Steindachner). 



Habitat: Amazons; Guiana. 

 A24. Mcenkhausia copei (Steindachner). 



Habitat : Para to Santarem. 

 A25. Mcenkhausia cotinho Eigenmann. 



Habitat: Para. 

 A26. Mcenkhausia ceros Eigenmann. 



Habitat : Lake Hyanuary. 

 27. Mcenkhausia browni Eigenmann. 



Habitat : Potaro River above and be- 

 low the Kaieteur. 



28. Mcenkhausia shideleri Eigenmann. 

 Habitat : Essequibo Basin. 



TETRAGONOPTERUS Cuvier. 



Type : Tetragonoptcrus argenteus Cu- 

 vier. 



Range: Orinoco and Guianas; Ama- 

 zons and south to Rio Parahyba and 

 La Plata. 

 A I. Tetragonopterus argenteus Cuvier. 



T. rufipes Valenciennes ; T. sana Castel- 



nau. 



Habitat : La Plata Basin to Guiana. 

 A2. Tetragonopterus huberi Steindachner. 



Habitat: Rio Purus. 

 A3- Tetragonopterus chalceus Agassiz. 



T. artedii and schomburgkii Cuvier & 



Valenciennes; T. ortoni Gill. 

 Habitat : Amazons and Guiana. 

 4. Tetragonopterus gibbosus Steindachner. 

 Habitat : Parahyba. 



MARKIANA Eigenmann. 



Type : Tetragonopterus nigripinnis Pe- 

 rugia. 

 Range La Plata and Orinoco. 



1. Markiana nigripinnis (Perugia). 



Tetragonopterus anomalus Steindach- 

 ner. 

 Habitat: La Plata Basin. 



2. Markiana geayi Pellegrin. 



Habitat : Apure, Venezuela. 



Subfamily DIAPOMIN.E. 



DIAPOMA Cops. 



Type : Diapoma speculiferum Cope. 

 Range that of the single species. 



i. Diapoma speculiferum Cope. 

 Habitat: Rio Grande do Sul. 



Subfamily STEVARDIIN.E. 



STEVARDIA Gill. r. Stevardia albipinnis Gill. 



Corynopoma and Nematopoma Gill. Corynopoma riisei and veedonii Gill; 



Type : Stevardia albipinnis Gill. Nematopoma searlsii Gill. 



Range that of the single species. Habitat : Trinidad. 



