398 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



Family HYPOPHTHALMID^E. 



HELOGENES Gunther. 1 N otophthalmus Hyrtl; Pseudohypoph- 



thalmus Bleeker. 

 Type : Helogenes marmoratus Gunther. . 



Ai. Hypophthalmus edeniatus bpix, 

 Range that of the single species. 



~.. .. . ", - 



I. Heloeencs marmoratus Gunther, . , ..... 



Hypophthalmus marginatus, longifilis 



*-* ** *-* 3^3" * A w 



., and ^/>zjru Cuvier & Valenciennes; 



Habitat: Essequibo. , .... , . 



//. edentulus Castelnau ; //. jimbn- 



atus Kner ; //. perporosus Cope. 



HYPOPHTHALMUS Spix. Habitat : Amazons and tributaries, and 



Type: Hypophthalmus edentatus Spix. northward. 



Family PYGIDIID^. 



Subfamily CETOPSIN^:. 



HEMICETOPSIS Agassiz. PSEUDOCETOPSIS Bleeker. 



Type: Silurus candiru Spix. T yP e: Ceiopsis gobioides Kner. 



Range: A narrow area from Para to Range: Irisanga, Maranon. 



Ecuador I- P* eu docetopsis gobioides (Kner), 



Ai. Hemicetopsis candiru (Spix), E> & El ' 322> 



E. & E., 319. Habitat: Irisanga. 



Habitat: Rio Cupai to Rio Huallaga. Aa ' P^docetopsis ventralis (Gill), 



A2. Hemicetopsis plumbeus Steindachner, ' ' ^ 22 ' 



r? p T- Habitat: Maranon. 



r,. & H., 3 2 - 



Habitat: Canelos. 3- Pseudocet P sis macroteronema (Bool- 



enger), ........ Boulenger, 1898, 8. 



Habitat: Rio Zamora, eastern Ecuador. 

 CETOPSIS Agassiz. 



Type : Silurus ccecutiens Lichtenstein. CETOPSOGITON Eigenmann & Bean. 



Range that of the single species. Type : Cetopsis occidentalis Steindach- 



Ai. Cetopsis ccecutiens (Lichtenstein), ner. 



E. & E., 320. i. Cetopsogiton occidentalis (Steindach- 



Habitat: Amazon from Gurupa to Rio ner), .............. E. & E., 322. 



Cupai ; Orinoco ; Irisanga. Habitat : Guayaquil. 



Subfamily PYGIDIIN^E. 

 NEMATOGENYS Girard. Habitat : Central Chili. 



Type : Trichomycterus inermis Guiche- 



no t. PARIOLIUS Cope. 



Range that of the single species. Type : Pariolius armillatus Cope. 



Nematogenys inermis (Guichenot), Range that of the single species. 



E. & E., 323. A I. Pariolius armillatus Cope, 

 Nematogenys nigricans and pallidus E. & E., 324. 



Philippi. Habitat: Ambyiacu. 



1 This genus is a member of a new family. 



