SOUTH AMERICAN NEMATOGNATHI. 275 



gg. Aual rays greatly crowded, 41, the base of the anal not longer 

 than in the preceding species. analis 224. 



212. Trachycorystes glaber, 



Auchenipterus ylaber Steindachner, SB. Ak. Wien, Ixxiv, 1876, 

 Siisswasserfijche siidostl. Bras, iii, 97, footnote (Demarara). 



Trachycorystes ylaber Eigenm. & Eigenm. Proc. Cal. Acad. 2d Ser. 

 i, 154, 1888 (name only). 



Habitat: Demarara. 



This species is known only from the types in the Vi- 

 enna Museum. 



213. Trachycorystes isacanthus. 



Auchenipterus isacanthus Cope, Proc. Am. Philos. Soc. xvii, 677, 



1878 (Peruvian Amazon). 

 Trachycorystes isacanthus Eigenm. & Eigenm. Proc. Cal. Acad. 2d 



Ser. i, 154, 1888 (name only). 

 Habitat: Maranon. 



214. Trachycorystes insignis, 



Auchenipterus insignis Steindachner, Fisch-fauna Magd. Stromes, 



19, pi. iii, figs. 2-2a, 1878 (Magdalena Kiver); id. Fisch-fauna 

 des Cauca & Fliisse bei Guayaquil, 10, 1879 (Cauca). 



Trachycorystes insignis Eigenm. & Eigenm. Proc. Cal. Acad. 2d Ser. 



i, 154, 1888 (name only). 

 Habitat: Kio Magdalena and its tributaries. 



This species is known only from the description and 

 figure by Dr. Steindachner. 



215. Trachycorystes obscurus, 



Auchenipterus obscurus Giinther, Ann. & Mag. Nat. Hist, xii, 442, 

 1863 (Essequibo); id. Cat. Fish. Brit. Mus. v, 195, 1864. 



Trachycorystes obscurus Eigenm. & Eigenm. Proc. Cal. Acad. 2d 

 Ser. i, 154, 1888 (name only). 



Habitat: Essequibo. 



This species is known only from the types in the Brit- 

 ish Museum. 



216. Trachycorystes magdalenae. 



Auchenipterus mag dalence Steindachner, Fisch-fauna Magd. Stromes, 



20, pi. iv, figs. 1-ltt, 1878 (Magdalena River). 

 Trachycorystes magdalence Eigenm & Eigenm. Proc. Cal. Acad. 2d 



Ser. i, 155, 1888 (name only). 

 Habitat: Magdalena Kiver. 



This species is known only from the types in the Vien- 

 na Museum. 



