DR. GtJlSrTHER ON THE FISHES OF CENTRAL AMERICA. 



405 



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

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

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

 supposed to have been a portion of a marine channel. 



Heros eiythrseus. Heros lobochilus. 



managuensis. 

 labiatus. 



multispinis. 



Neetroplus nematopus. 



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

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



Heros labiatus (Lake of Managua). 

 Pimelodus nicaraguensis. 

 Gambusia uicaraguensis. ■ 

 Pcecilia dovii (in common with Lake 



Eleotris longiceps. 

 Heros longimanus. 



citrinellus. 



dovii. 



niearasruensis. 



Amatitlan) . 



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

 Barren. — 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 witli 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 nasutum 

 monticola . . 



R. Bayano. 



Heros parma Chagres. 



altifrons 



Acara caeruleomaculata .... Chagres. 



Arius multiradiatus — 



iElurichthys dorsalis — 



panamensis 



Pimelodus wagueri ...... — 



• • modestus . , Chagres. 



Plecostomus, sp Chagres. 



Clitetostomus aspidolepis .... — 



Cliaitostomus '(cirrhosus .... Chagres. 



Loricaria lima Chagres. 



Panama. 

 Panama. 



Western Veragua. 



Panama. 

 Panama. 

 Panama. 



Veragua. 



R. Bayano. 



