DR. GiJNTHER ON THE FISHES OF CENTRAL AlVIERICA. 



405 



D. Lake of Managua. — Althougli the number of species known from this lake is 

 small, the forms are quite peculiar ; we find here those species of Hews which are 

 distinguished by the extraordinary development of the lips, or by incisor-like teeth, 

 which render the separation into a distinct genus necessary. The development ot 

 these Chromides is the more remarkable, as this lake occupies a space which is 

 supposed to ha^'e been a portion of a marine channel. 



Ileros ervtlmcus. Ilcros lobocliihis. 



managuensis. 

 labiatus. 



• multispinis. 



Neetroplus nematopus. 



E. Lake of Nicaragua. — Also the fishes of this lake are, with two exceptions, pt-culiar ; 

 like Lake Managua, it appears to have been part of a marine channel. 



Heros lubiatm (Lake of ^Luiagiia). 

 Pimelodus nicaraguensis. 

 Gambusia nicaraguensis. 

 Poecilia dovii (in common with Lake 

 Amatitlan). 



Eleotris longiceps. 

 Heros longimanus. 



citrinellus. 



dovii. 



nicaraguensis. 



F. The fresh waters south of the Lakes of Managua and Nicaragua to the Lsthmas of 

 Darien. — We are obliged, at present, to unite into one province the fish-fauna of Costa 

 Rica, Veragua, Panama, and Darien, as our knowledge of the fishes of Costa Rica and 

 also of Veragua is too incomplete to admit of a comparison with those of the more 

 southern part of the isthmus. This is the more to be regretted, as a former separation 

 of these two parts and of their faunas is, as we have explained above, a matter of great 

 probability. The fishes of the Chagres River show a decidedly South-American cha- 

 racter. The identity of the freshwater fish-faunas of the Pacific and Atlantic sides is 

 here easily explained by the narrowness of the isthmus. 



Eleotris picta 



Agonostoma nasutuui — 



moniicola — 



Heros parma ("liagrcs. 



altifrons 



Acara cieruleomaculata .... Chagres. 



Arius multiradiatus — 



^Elurichthys dorsalis — 



panamensis — 



Pimelodus wagueri — 



modestus Chagres. 



Plecostonuis, sp Chagres. 



Ch;etostomiis aspidolepis .... — 



('hcelos-lomiis 'f rirr/iosiis .... Chagres. 



Loricurhi limn Chagres. 



R. Bavano. 



Panama. 

 Panama. 



Western ^'e^agua. 



R. Bavano. 



Panama. 

 Panama. 

 Panama. 



Veragua. 



