^"i«uk"'] proceedings of the national museum. 



Xlll. 



Genera peculiar to the Sail Francisco and its tributaries : 

 1. Bagropsis 1 sp. j 2. Duoijalatinus 



XIV. 



17 



1 sp. 



Genera peculiar to tbe rivers of* soutlieasteru Brazil, between the 

 Eio San Francisco and the La I'iata, but exclusive of those rivers: 



Ginora. Distribution. 



1. Steindachnoria 3 sp. Parabyba ; Doce ; Jeqiiitiulionlia. 



2. Wertbeimeria 1 sp. Jequitiubouba. 



3. llaittia 1 sp. 



4. Hisonotus I sp. Parabyba; Santa Cruz. 



5. Parotocinclus 1 sp. Santa Cruz. 



6. Delturus 2 sp. Ivio Mui;uri ; Kio Parabyba. 



7. Heuiipsilicblbys 1 s[). Kio Parabyba. 



8. Scleromystax 1 sp. Kio Janeiro. 



1). Henocbilus I sp. Rio Mucuri. 



Average number of species to each genus, I3 + . 



XV. 

 Genera peculiar to the high Andes of Peru, Ecuador, and Colombia: 



1. Arges 4 sp. 



2. Cyclopium 2 sp. 



3. Orestias 4 sp. 



4. Gastropterus 1 sp. 



5. Protistius, 1 sp. 



Average number of species to each genus, 2.G. 



XVI. 



Genera peculiar to the La Plata and its tributaries : 



1. Cocbliodon, 1 sp. 



Genera of wide distribution 

 related are indicated by Eoin 



XVII. 



. The lists to which they are most nearly 

 an numerals: 



Genera. 

 II. Rbamdella 8 sp. or more. 



II. Cba'tostomus 



II. Pygidiuni 



II, Cbaracidium 



VII. Leporellus 



VI [. Paragouiatus , 



III. Salmiuus 



VI. Arapainia 



I. Gabxxias 



20 sp. 

 2.") sp. 



4 sp. 

 1 sp. 

 3 sp. 

 Jj sp. 

 1 sp. 



5 sp. 



I. Aplocbitou 2 sp. 



III. Pacbyurus 4 sp. 



Average number of species to each genus, 7+ 

 Proc. N. M. 91 2 



Distribution. 



Southeastern Brazil; Amazon; Central 

 America. 



Cbietly in upper courses of rivers. 



Cbielly in mountainous regions. 



Parabyba to Orinoco ; Marauon. 



Rio das Velbas; Amazons; Cauca. 



Amazons; Rio Janeiro. 



La Plata; San Francisco; Jacuby ; Cauca. 



Babia; Amazons and nortbward. 



Falkland Islands; Terra del Fuego; (An- 

 des of Peru ?). 



Terra del Fuego ; Falkland Islands, 



San Francisco; La Plata; Amazons. 



