eigenmann: the cheirodontin^. 



13 



The paired species are as follows : 



Rio Madeira and its tributaries 



Aphyocharax alburnus 

 Aphyocharaz pusillus 

 Prionobrama filigerus 



Rio Paraguay 



Aphyocharax dentatus 

 Aphyocharax anisitsi 

 Prionobrama paraguayensis 



Cheirodon pisciculus, which ranges in western Chile at least from Santiago to 

 Puerto Montt, is one of two species of this group found on the Pacific slope. This 

 species also has the distinction of being the only member of the family of Characins 



Fig. 2. Phylogenic arrangement of the genera of the CheirodontiniE. In tliis diagram the letters cor- 

 respond to and have the significance of the same letters in the following key. The genus Paragoniates, in 

 the diagram, includes the genus Prionobrama, now recognized as distinct. 



