412 



I'ATAGONIAX EXPEDITIONS : ZOOLOGY. 



PsEUDACANTHicus Bleeker. 

 Type: Hypostomns serratus Cuvier & 



Valenciennes. 

 Range: Amazon to Surinam. 

 I. Pseudacanthicus serratus (Cuvier & Va- 

 lenciennes) Regan, 260. 



Habitat: Surinam. 

 .\2. Pscudacantliicus spiuosus (Castelnau), 

 Regan, 260. 

 Habitat: Amazon. 

 3. Pscudaca)itliicus fordii (Giinther), 



Regan, 261. 

 Habitat: Surinam. 

 A4. Pseudacanthicus hystrix (Cuvier & 



Valenciennes), Regan, 261. 



Habitat : Rio Negro. 



LiTHOXUS Eigenmann MS. 



Type : Lithoxus litlioides Eigenmann. 

 Range that of the single species. 

 I. Litlioxus lii/ioides Eigenmann MS. 



Habitat: Cataracts of British Guiana. 



ACANTHICUS Spix. 

 Type: Acanthicus hystrix Spix. 

 Range that of the single species. 

 .\i. Acanthicus hystrix Spix, Regan, 262. 

 Rhinelepis acanthicus Cuvier & Valen- 

 ciennes. 

 Habitat: Amazon; Guiana. 



HvPOPTOroMA Giinther. 

 Type: Hypoptopoma thoracatuni Giin- 

 ther. 

 Range: Upper Amazon. 

 Ai. Hypoptopoma thoracatuni Giinther, 



Regan, 263. 

 Hypoptopoma bilobatum Cope. 

 Habitat: Upper Amazon. 

 A2. Hypoptopoma joberti (Vaillant), 



Regan, 265. 

 Otocinclus bilohatus Steindachner, non 

 Cope. 



Habitat: Upper Amazon; Jurua. 

 Hypoptopoma steindachneri Boulenger. 

 .\3. Hypoptopoma thoracatuni Steindach- 

 ner, non Giinther. 

 Habitat : Amazons. 

 A4. Hypoptopoma gularc Cope, 



Regan, 265. 

 Habitat : Upper Amazon. 



OXYROPSIS Eigenmann & Eigenmann. 

 Aristoviata Holmberg. 

 Type : Oxyropsis wrightiana Eigen- 

 mann & JL'igQnm&nn- Hypostomus 

 carinatus Steindachner. 

 Range: Upper Amazon and Paraguay. 

 .\i. Oxyropsis carinatus (Steindachner), 

 Regan, 264. 

 Oxyropsis wrightiana E. & E. 

 Habitat: Upper Amazon. 

 2. Oxyropsis incxpcctatus (Holmberg), 



Regan, 264. 

 Oxyropsis gihithcri (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 flcxilis Cope, .... Regan, 267. 



Otocinclus fimbriatus Cope. 

 Habitat: Rio Grande do Sul. 



5. Otocinclus leucofrenatus Ribeiro, 



Ribeiro, 1 908. 

 Habitat: Ribeira. 



6. Otocinclus nofatus (Eigenmann & Eigen- 



mann), Regan, 268. 



