412 



PATAGONIAN EXPEDITIONS : ZOOLOGY. 



PSEUDACANTHICUS Bleeker. 



Type : Hypostomus serratus Cuvier & 



Valenciennes. 

 Range: Amazon to Surinam. 

 I. Pseudacanthicus serratus (Cuvier & Va- 

 lenciennes) , Regan, 260. 



Habitat: Surinam. 

 A2. Pseudacanthicus spinosus (Castelnau), 



Regan, 260. 

 Habitat : Amazon. 

 3. Pseudacanthicus fordii (Giinther), 



Regan, 261. 

 Habitat: Surinam. 

 A4. Pseudacanthicus hystrix (Cuvier & 



Valenciennes), Regan, 261. 



Habitat : Rio Negro. 



Lithoxus Eigenmann 'MS. 



Type : Lithoxus litJioides Eigenmann. 

 Range that of the single species. 

 1. Lithoxus lithoides Eigenmann MS. 



Habitat: Cataracts of British Guiana. 



Acanthicus Spix. 



Type: Acanthicus hystrix Spix. 

 Range that of the single species. 

 Ai. Acanthicus hystrix Spix, Regan, 262. 

 Rhinelcpis acanthicus Cuvier & Valen- 

 ciennes. 

 Habitat : Amazon ; Guiana. 



Hypoptopoma Giinther. 



Type : Hypoptopoma thoracatum Giin- 

 ther. 

 Range : Upper Amazon. 

 Ai. Hypoptopoma thoracatum Giinther, 



Regan, 263. 

 Hypoptopoma bilobatum Cope. 

 Habitat: Upper Amazon. 

 A2. Hypoptopoma joberti (Vaillant), 



Regan, 265. 

 Otocinclus bilobatus Steindachner, non 

 Cope. 



Habitat: Upper Amazon; Jurua. 

 Hypoptopoma steindachneri Boulenger. 

 A3. Hypoptopoma thoracatum Steindach- 

 ner, non Giinther. 

 Habitat : Amazons. 

 A4. Hypoptopoma gulare Cope, 



Regan, 265. 

 Habitat : Upper Amazon. 



Oxyropsis Eigenmann & Eigenmann. 



Aristomata Holmberg. 

 Type: Oxyropsis wrightiaua Eigen- 

 mann & Eigenmann = Hypostomus 

 carinatus Steindachner. 

 Range : Upper Amazon and Paraguay. 

 Ai. Oxyropsis carinatus (Steindachner), 



Regan, 264. 

 Oxyropsis wrightiaua E. & E. 

 Habitat : Upper Amazon. 

 2. Oxyropsis inexpectatus (Holmberg), 



Regan, 264. 

 Oxyropsis giintheri ( Boulenger) , 

 Habitat : Paraguay. 



Otocinclus Cope. 



Hisonotus Eigenmann & Eigenmann. 

 Type : Otocinclus vestitus Cope. 

 Range : Southeastern Brazil, Paraguay 

 and Ambyiacu. 



1. Otocinclus affinis Steindachner, 



Regan, 267. 

 Habitat: Santa Cruz. 



2. Otocinclus vittatus Regan, . . Regan, 267. 



Habitat : Paraguay. 

 A3. Otocinclus vestitus Cope, . . Regan, 267. 

 Habitat : Ambyiacu. 



4. Otocinclus flexilis Cope, .... Regan, 267. 



Otocinclus fimbriatus Cope. 

 Habitat: Rio Grande do Sul. 



5. Otocinclus leucofrenatus Ribeiro, 



Ribeiro, 1908. 

 Habitat: Ribeira. 



6. Otocinclus notatus (Eigenmann & Eigen- 



mann), Regan, 268. 



