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PATAGONIAN EXPEDITIONS : ZOOLOGY. 



Family HYPOPHTHALMIDjE 

 Helogenes Giinther. 1 



Type : Helogenes marmoratus Giinther. 

 Range that of the single species, 

 i. Helogenes marmoratus Giinther, 



E. & E., 313. 

 Habitat : Essequibo. 



Hypophthalmus Spix. 

 Type : Hypophthalmus edentatus Spix. 



Notophthalmus Hyrtl ; Pseudohypoph- 



thalmus Bleeker. 

 A 1. Hypophthalmus edentatus Spix, 



E. & E., 313. 

 Hypophthalmus marginatus, longifilis 



and spixii Cuvier & Valenciennes; 



H. edentulus Castelnau ; H. fimbri- 



atus Kner; H. perporosus Cope. 

 Habitat : Amazons and tributaries, and 



northward. 



Family PYGIDIIDyE. 



Subfamily Cetopsin^E. 



Hemicetopsis Agassiz. 



Type : Silurus candiru Spix. 

 Range : A narrow area from Para to 

 Ecuador. 

 Ai. Hemicetopsis candiru (Spix), 



E. & E., 319. 

 Habitat: Rio Cupai to Rio Huallaga. 

 A2. Hemicetopsis plumbeus Steindachner, 



E. & E., 320. 

 Habitat : Canelos. 



Cetopsis Agassiz. 



Type : Silurus coocutiens Lichtenstein. 

 Range that of the single species. 

 Ai. Cetopsis ccecutiens (Lichtenstein), 



E. & E., 320. 

 Habitat : Amazon from Gurupa to Rio 

 Cupai ; Orinoco ; Irisanga. 



Pseudocetopsis Bleeker. 



Type : Cetopsis gobioides Kner. 

 Range: Irisanga, Maraiion. 

 1. Pseudocetopsis gobioides (Kner), 



E. & E., 322. 

 Habitat: Irisanga. 

 A2. Pseudocetopsis veutralis (Gill), 



E. & E., 322. 

 Habitat: Maraiion. 

 A3. Pseudocetopsis macroterouema (Boul- 



enger), Boulenger, 1898, 8. 



Habitat : Rio Zamora, eastern Ecuador. 



Cetopsogiton Eigenmann & Bean. 



Type : Cetopsis occidentalis Steindach- 

 ner. 

 1. Cetopsogiton occidentalis (Steindach- 

 ner), E. & E., 322. 



Habitat : Guayaquil. 



Subfamily PYGIDIIN^:. 



Nematogenys Girard. 



Type : Trie homy cterus inermis Guiche- 



not. 

 Range that of the single species. 

 Nematogenys inermis (Guichenot), 



E. & E.. 323. 

 Nematogenys nigricans and pallidus 

 Philippi. 



1 This genus is a member of a new family. 



Habitat : Central Chili. 



Pariolius Cope. 



Type : Pariolius armillatus Cope. 

 Range that of the single species. 

 A 1. Pariolius armillatus Cope, 



E. & E., 

 Habitat: Ambyiacu. 



324- 



