PROCEEDINGS 



OF THE 



WASHINGTON ACADEMY OF SCIENCES 



Vol. VIII, pp. 449-458. Plates XXI-XXIII March 4, 1907. 



ON A COLLECTION OF FISHES FROM 

 BUENOS AIRES. 1 



By Carl H. Eigenmann. 



The present paper is a report on a collection of fishes obtained 

 near Buenos Aires, Argentina, by Prof. W. B. Scott, of Prince- 

 ton University. The collection adds several species to the La 

 Plata fauna. These are marked*. Four of these species are 

 new. The types are in the Museum of Princeton University, and 

 a series of cotypes and duplicates is in the Museum of Indiana 

 University. 



The fresh-water fish fauna of Buenos Aires is essentially 

 Amazonian and in striking contrast to the fresh-water fauna of 

 North America of corresponding latitude and equally remote 

 from the mouth of the Amazon which lies on the equator. 

 None of the Amazon genera has passed much beyond the 

 borders of the United States. Most of them do not reach 

 beyond Panama. The Paraguay, whose sources are in contact 

 with those of the Tapajos and Madeira, southern tributaries of 

 the Amazon, has provided an easy and open road for the 

 Amazon fauna to the Lower Parana and La Plata. But few 

 Amazon types extend south of Buenos Aires. 



silurid^:. 



Luciopimelodus pati Valenciennes. 



One specimen. 

 Pseudaplatystoma coruscans Agassiz. 



One specimen. 



* Contributions from the Zoological Laboratory of Indiana University, No. 

 80. 



Proc. Wash. Acad. Sci., March, 1907. 449 



