eigenmann: fresh water fishes. 315 



3. Magdale7ia Province. 



The fauna of the Rio Magdalena, as far as known, is of peculiar interest, 

 in connection with the fauna of the Pacific Province. The Madalena basin 

 is Y-shaped. The right (thick) arm and stem form the Rio Magdalena 

 proper, draining the area between the eastern and central Andes of south- 

 ern Colombia. The left arm of the Y is the Cauca, which drains the 

 area between the central and the western Andes of Colombia. The 

 central Andes appear to stop at the junction of the arms of the Y. 



The Magdalena has an elevation of 1600 m. at San Augustin, 1000 

 m. at Timana and 400 m. at Neiva. There are rapids at the 5th degree 

 of north latitude about Pescaderias. In its lower course it is a much- 

 branched and divided stream. Its length is about 1350 km. and it drains 

 300,000 square kilometers. The Cauca at Popayan has an elevation 

 of 1740 m. It is marked with rapids at Quilichao 1070 m., and again, 

 below Cartago, 900 m., and between Antioquia and Caceres. 



Nearly all that is known of the fauna of this river has been contributed 

 by Steindachner in three papers, in which the following fresh-water species 

 are enumerated (exclusive of mountain forms). 



Species *, and genus **, peculiar to the Magdalena; species /, and 

 genus //, peculiar to Magdalena, Panama and western slopes of Ecuador. 

 A, also found in the Amazon. 



* Potainotrygon magdakncu Steindachner. 

 A Pseitdopinielodus zuugayo (Humboldt). 

 A RJianidia sebce (Cuvier & Valenciennes). 

 A Pinielodus clarias (Bloch). 



* Pimelodiis grosskopfii Steindachner. 



A Pseiidoplaty stoma fasciatmn (Linnaeus). 

 A Sorubini lima (Bloch & Schneider). 



* Doras lougipiiinis Steindachner. 

 TracJiycorystes insignis (Steindachner). 

 TracJiycorystes magdalence (Steindachner). 



* AgeneiosHS cancamis Steindachner. 

 A Ageneiosiis dentatus Kner. 



? Pygidinm, probably several species in upper reaches of the rivers. 

 A Hoplosteniinn thoracatimi Cuvier & Valenciennes. 

 A Plecostomus emarginatus Cuvier & Valenciennes. 



* Panaque cocJiliodoii (Steindachner). 



