SOUTH AMERICAN NEMATOGNATHI. 119 



PRELIMINARY NOTES ON SOUTH AMERICAN 

 NEMATOGNATHI. 



I. 



BY CARL H. EIGENMANN AND ROSA SMITH EIGENMANN. 



The present paper contains a list of the species of Hypoph- 

 thalmidse, South American Siluridee, Argiidse and Callichthy- 

 idae, and of the genus Plecostomus (Loricariida?), with the 

 localities of the specimens contained in the Museum of 

 Comparative Zoology at Cambridge, Massachusetts, and 

 descriptions of the following new forms: 



1, Pimelodina nasus; 2, lAiciopimelodus; 3, Pseudopimel- 

 odus acaniJiochirus; 4, Bhamdia ohesa; 5, R. Poeyi; 6, Bham- 

 della (sub-genus); 7, Bhamdia tenella; 8, B. eriarcha; 9, R. 

 parryi (Mexico); 10, Pimelodella; 11, P. pedinifer: 12, 

 Sciadeoides (sub-genus); 13, Duopalafhius; 14, Stelndachneria; 

 15, S. amhlyurns; 16, Pseudoplaty stoma fasciatum inter- 

 medium; 17, Tachisurus lentiginosus; 18, T.jordani; 19, T. 

 longicephalus; 20, T. agassizii; 21, T. gidosus; 22, Ageneiosus 

 atronasus; 23, Auchenipterus fordicei; 24, Felichthys fiaves- 

 cens; 25, Trachycorystes porosus; 26, T. analis: 27, Hassar; 

 28, Dora^ uranoscopus; 29, D. spinosissimus; 30, Decapogon; 

 31, Corydoras hastatus; 32, Plecostomus limosus; 33, P. com- 

 mersonii scabriceps; 34, P. seminudus; 35, P. macrops: 36, 

 P. vermicularis. 



The specimens in the Museum were collected by Professor 

 Louis Agassiz and his assistants during the Thayer Expedi- 

 tion in Brazil, and by Professor "Agassiz and Dr. Steindach- 

 ner during the Hassler Expedition around South America. 

 The names of collectors of new forms are given with the 

 descriptions. 



A fuller account of all the species mentioned will be 

 published later. 



2d Ser. Vol. I. (9) Issued July 18, 1888. 



