NEW GENERA OF SOUTH AMERICAN FRESH-WATER 

 FISHES, AND NEW NAMES FOR SOME 

 OLD GENERA 



By CARL H. EIGENMANN 



In attempting to define the genera of the South American Hetero- 

 gnaths it was found that a number of new genera deserve recognition, 

 and that the names of some of the best-known genera are preoccu- 

 pied by the earlier use of the same names. In the following pages 

 the new genera are briefly defined and new names are suggested 

 where needed. The relationship of the new genera will be pointed 

 out in a general work on the Heterognaths which was begun sixteen 

 years ago and which it is hoped will soon be finished. 



I. ANISITSIA Eigenmann & Kennedy 

 New genus of Chilodinse allied to Hemiodus. 

 Third suborbital not enlarged. Teeth in upper jaw flat, serrated ; 

 no teeth in lower jaw. Scales below the lateral line much larger 

 than those above it ; scales moderate or large. 

 Type. — Anodus notatus Schomburgk. 

 Named for Prof. J. Daniel Anisits, of the University of Paraguay. 



2. LAHILLIELLA Eigenmann & Kennedy 

 New subgenus of Anostomus. 

 Teeth in lower jaw in a single series, multicuspid. Lateral line 

 complete, faint. Dorsal over ventrals. Nares remote. Snout 

 broad, subelliptic in cross-section. Mouth directed obliquely down- 

 v/ard and forward, lower jaw the shorter. 

 Type. — Schizodon nasutus Kner. 

 Named for F. Lahille, of the Museo de la Plata. 



3. HOLOSHESTHES 

 New genus of Tetragonopterinse, allied to Cheirodon. 

 Premaxillaries and mandible with a single series of many-pointed 

 incisors ; maxillaries with teeth along its entire edge. Lateral line 

 complete. 



Type. — Cheirodon pequira Steind. 



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