﻿Eigenmann: Magdalena Basin 



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Ageneiosus dentatus (K.) 



Astroblepus cyclopus (H.) 

 *Astroblepus grixalvii H. 

 *Astroblepus longifilis (St.) 

 *Corydoras melanotsenia R. 

 *Pseudancistrus daguse (E.) 

 *?Pseudancistrus pediculatus (E.) 

 ?Sturisoma aurea St. 

 *Sturisoma leightoni (R.) 



Curimatus magdalenas St In Maracaibo only east of the Cordilleras. 



Parodon suborbital^ C. and V. In Maracaibo. 

 ?Abramites eques (St.) 



Leporinus striatus K. 



Characidium fasciatum R. 



Pyrrhulina semifasciata R. 



Hyphessobrycon inconstans (E. and 0.) 



Astyanax fasciatus (C.) 

 *Creagrutus beni E. 



Rceboides dayi St. 



?Ctenolucinus insculptus St. In Lake Maracaibo? 



*HopHas malabaricus (Bl.) 



*Gymnotus carapo L. 



*Sternopygus macrurus (Bl and Sch.) 



Eigenmannia virescens (V.) 



Hypopomus brevirostris St. 



Synbranchus marmoratus Bl. 



Tarpon atlantieus (C. and V.) 



Plagioscion surinamensis (Bl.) 



One looks in vain for any common physical character in this 

 series of species. Some are huge fishes, Pseudoplatystoma; 

 others are very small, Characidium. The great majority are 

 fishes of the lowlands (1,000 feet and less) and comparatively 

 quiet waters. Such fishes as Astroblepus and Pygidium ought 

 perhaps to be excluded, since they are found at the very highest 

 localities "where an occasional crossover may still be expected. 

 At the other extreme such species as the Tarpon which enter the 

 sea might also be excluded, and in fact those found on both sides 

 in estuaries only are not given. 



Leaving these out of count, the one thing most of them have 

 in common is their very wide distribution. This signifies either 

 facility in getting about or a greater staying quality of their 

 specific characters under varying environments, or both. Paral- 

 lel forms have developed in nearly all of the genera found on the 

 two sides in which the species have not remained the same. It 

 would take us too far to go into all of these. 



