EIGENMANN: THE FRESHWATER FISHES OF BRITISH GUIANA 



99 



Aspredinidae 



Siluridae: 



Pimelodinae 



Doradinae 



Auchenipterinae . . 



Ageneiosinae 



Helogeneidae 



Pygidiidae: 



Cetopsinae 



Pygidiinae 



Callichthyidae 



Loricariidae: 



Plecostominae 



Loricariinae 



Characidae: 



CurimatinsB 



Prochilodina? 



Hemiodinae 



Chilodinae 



Nannostomatinae 



Anostomatime. . . 



Leporinae 



Pyrrhulininse . . . . 



Crenuchinae 



Iguanodectinae . . . 



Tetragonopterina? 



Brycoiiina? 



Chalcinina? 



Brachycalcininse . . 



Gasteropelicinae . . 



Serrasalminae . . . . 



Mylina? 



Characinae 



Acestrorhynchinae 



Erythrininae 



Gymnotidae: 



Electrophorinffi. . . 



Sternarchinae . . . . 



Hypopominae . . . . 



Gymnotinae 



Poeciliidae 



Belonidae 



SciaDnidae 



Cichlidae 



Achiridas 



140 



87(102?) 58(71?) | 36(44?) 



23 



2. Whence did the fauna of the plateau come? 



A. Is it the nucleus of the original fauna of Guiana? Or 



B. Have the faunas on the plateau and the lowland developed from a 



common nucleus? Or 



C. Is it a relict of a more abundant modern fauna? Or 



D. Does it consist of recent immigrants? Or 



E. Is it a mixture? 



To assist in answering these questions I give the species of the plateau with 

 their distribution in the Potaro and also their general distribution in South America. 



