16 FRESH-WATER FISHES OF SOUTH AMERICA EIGENMANN. 



13. Laemolyta* 1 sp 



14. Anodus 3 sp. 



15. Potamorhina 1 sp. 



16. Bryconops . 2 sp. 



17. Stethaprion 3 sp. 



18. Monocirrhus 1 sp. 



Pteropliyllum 1 sp. 



Average number of species to each genus about If. 



19. Mesonauta 1 sp. 



20. Crenicara 1 sp. 



21. Dicrossus 1 sp. 



22. Uaru 3 sp. 



23. AstroDotus 3 sp. 



24. Sympbysodou 1 sp. 



VIII. 



Genera peculiar to the Amazon and its tributaries, including the Rio 

 Negro : 



1. Elipesurus 1 sp. 



2. Bunocephalichtliys 1 sp. 



3. Pimelodiaa 2 sp. 



4. Platystomatichtbys 1 sp. 



5. Oxyropsis 1 sp. 



6. Rhytiodus 2 sp. 



Average number of species to each genus, 1^. 



IX, 

 Genera peculiar to the Solimoens and its tributaries 



1 . Nemuroglanis 1 sp. 



2. Tracbelyoptericbtliys 1 sp. 



3. Tridens 2 sp. 



4. Miuroglauis 1 sp. 



.5. Cb;etobraiicbopsis 1 sp. 



6. Saraca 1 sp. 



Average number of species to each genus, 1^. 



X. 

 Genera i)eculiar to the Marauou and its tributaries 



1. Dysicbtbys 1 sp. 



2. Nauuoglauis 1 sp. 



3. Pbysopyxis 1 sp. 



4. Stegopbiloides 1 sp. 



5. Diauema 1 sp. 



6. Brocbis 4 sp. of 2 subgenera. 



7. Pletbodectes 1 sp. 



8. Iguanodectes 1 sp. 



9. Apbiocbarax 3 sp. 



10. Metyuuis 1 sp. 



Average number of species to each genus, 1.5. 



XL 



Genera peculiar to the Guianas:t 

 1. Helogeues 1 sp. | 4. Anableps 1 sp. 



2. Agouiatus 1 sp. 



3. Catopriou 1 sp. 



One sp. iu Guatemala. 



Polycentrus 2 sp. 



Average number of species to each genus, 1|. 



XII. 



Genera peculiar to the Rio Magdalena : 



1. Eremopbilus 1 sp. i 3. Luciocbarax 1 sp. 



2. Astroblepus 1 sp. | (Found also iu tbe Mamoui River. ) 



* Siuce tbis was written it bas been found tbat Lcemolyta occurs also in tbe Orinoco 

 and contains 4 species. 



t Stevardia of four species in Trinidad. 



