SOUTH AMERICAN NEMATOGNATHI. 275 



gy. Anal rays greatly crowded, 41, the base of the anal not longer 

 than in the preceding species. analis 224. 



212. Trachycorystes glaber. 



Auchenipterus t/laber Steindachner, SB. Ak. Wien, Ixxiv, 1876, 

 Siisswasserfiiche stidostl. Bras, lii, 97, footnote (Demarara). 



Trachycorystes (jlaber Eigenm. & Eigenrn. 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. 



Aucheniplerus 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. 



Aucheniptertis insiynis Steindachner, Fisch-fauna Magd. Stromes, 



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

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



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



i, 154, 1888 (name only). 

 Habitat: Eio Magdalena and its tributaries. 



This species is known only from the description and 

 figure by Dr. Steindachner. 



215. Trachycorystes obscurus. 



Auchenipterus obscurus Giiuther, 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. 



Auchenipterusmagdaleiuv Steindachner, Fisch-fauna Magd. Stromes, 



20, pi. iv, figs. 1-la, 1878 (Magdalena Eiver). 

 Trachycorystes magdalena' Eigenm & Eigenm. Proc. Cal. Acad. 2d 



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

 Habitat: Magdalena Eiver. 



This species is known only from the types in the A^ien- 

 na Museum. 



