X. — The South American Characinidse Collected by Charles 



Frederick Hartt.^ 



BY ALBERT B. ULREY. 



Read October 22, 1894. 



The present paper is based on the Characinidiie collected b}'^ 

 Charles Frederick Hartt in Brazil. The collection was made 

 during the summer of 1810 and presented to Cornell University, 

 the material remaining unidentified until the present. Some of 

 the species in this list have been described b^- Eigenmann and 

 Eigenmann from the collections of the Tha3'er expedition at Har- 

 vard Universit}' since this collection was made. There still 

 remain seven new species, four of them belonging to the genus 

 Tetragonopterus. 



For convenience of identification I have made keys to the 

 the genera Cheirodon, Aphiocarax and Tetragonopterus. T have 

 not had a sufficient number of specimens to determine the extent 

 of variations in these genera. Some of the species will prob- 

 ably be found to be synonyms, but on account of the insufficient 

 material at my disposal, and the incompleteness of many descrip- 

 tions these species have for the present been retained. A natural 

 grouping of the species is not claimed for the keys, the foremost 

 purpose being to facilitate identification. I have, however, used 

 those characters which are of most value in determining relation- 

 ships when such were known and could readily be used in identi- 

 fication. 



It is hoped that the keys and appended synopsis will materially 

 reduce the labor of identifying species of Tetragonopterus. I 

 can scarcely hope that the}* are entirely free from errors, and in 

 some parts they must of necessit}' be imperfect. It is believed, 



* Contributions from the Zoological Laboratory of the Indiana Univer- 

 sity, under the direction of Carl H. Eigenmann, No. VIII. 



