FISHES FROM NORTHERN CHACO 127 



8. Callichthys pecloralis, Blgr. 



9. Plecostomus bicirrhosus, Gron. 



10. Plecostomus commersonii, Val. 



11. Plecostomus cochliodon, Kner. 



12. Liposarcus pardalis, Cast. 



13. Chaetoslomus viltatus, Stdr. 



14. Hypoptopoma guentheri, Bigi-. 



15. Loricaria parva, Blgr. 



16. Macrodon trahira, Spix. 



17. Eryihrinus unilaeniatus, Spix. 



18. Leporinus frederici, Bl. 



19. Leporinus striatus, Kner. 



20. Tetragonopterus argenteus, Cuv. 



21. Tetragonopterus hauxwellianus, Cope. 



22. Tetragonopterus multiradiatus, Stdr. 



Probably not specifically distinct from the preceding. 

 23r Tetragonopterus fasciatus, Cuv. 

 24. Brycon microlepis, Perugia. 

 2b. Bryconops melanurus, Stdr. 



26. Anacyrtus microlepis, Rhdt. 



27. Serrasalmo rhombeus, L. 



28. Sternopygus virescens, Val. 



29. Carapus fasciatus, Pall. 



30. Symbranchus marmoratus, Bl. 



