EIGENMANN: THE FRESHWATER FISHES OF BRITISH GUIANA 



17 



of the junction of the Rupununi and Essequibo and started over to the Essequibo 

 and returned by way of the Berbice. 



4. On September 12, 1837, he again ascended the Essequibo and Rupununi 

 to the Rewa, up which he went and crossed over to the Cuyuwini, an upper tribu- 

 tary of the Essequibo. He descended it to the Essequibo, which he ascended to its 

 source. He then returned to the Rupununi about Lake Amucu, 5 whence he went 

 to Fort St. Joaquin on the Takutu. He left this place on September 20, 1838, 

 sailing up the Takutu to its tributary, the Mahu, swinging from here northwestward 

 to Roraima, thence southwestward to the Parima, up this river, and then, following 

 the mountains, to Esmeralda on the Orinoco, along the Cassiquiare to the Rio 

 Negro, down this river to the Rio Branco, and up this stream back to Fort San 

 Joaquin on April 22d. He returned thence to Georgetown on June 20, 1839. 



The species he figured and noted, together with the identification of those 

 dealt with in the present work, are given in the following list. Those from the 

 northern slope are marked with an asterisk; those which have been found on the 

 northern slope since Schomburgk's day are marked f- 



1. Acanthicus histrix Spix, p. 131, pi. 1. 



2. Loricaria cataphracta Linnaeus, p. 136. 



3. Hypostoma plecostomus Valenciennes, p. 



139. 



4. Hypostoma squalinum Schomburgk, p. 



142, pi. 2. 



5. Hypostoma punctatum Schomburgk, p. 



145, figure. 



6. Hijpostoma barbatus Cuv. & Val., p. 147. 



Vol. I. 



Rio Branco at Fort San Joaquin. 

 Locality? = Loricaria cataphracta (Linnaeus). 

 i. Rio Branco, 8 in. = Plecostomus plecostomus 



(Linnaeus). 

 >. Rio Branco, Rio Negro, Essequibo. 13J4 in. = 

 Plecostomus emarginatus (Cuv. & Val.). 

 Rio Branco. 6% in. 



* 7. Callichthys lon,gifilis Cuv. & Val., p. 150, 



figure. 



* 8. Callichthys ? p. 152, figure. 



t 9. Doras costatus Lacepede, p. 155. 

 flO. Doras cataphractus Linnaeus, p. 158. 

 11. Doras castaneo-ventris Schomburgk, p. 161, 



pi. 3. 

 *12. Doras brunnescens Schomburgk, p. 163. 



13. Doras niger Valenciennes, p. 165. 



14. Doras, p. 166. 



6 In recent works this word is spelled Amacu. 



Loc ? 6J4 i n - = Pseudancistrus barbatus (Cuv. & 



Val.). 

 Pools, marshes, and creeks. 8 in. = Hoploslernum 



thoracatum (Cuv. & Val.). 

 Curassarraka on the Rupununi. 

 12 in. = Doras costatus (Linnaeus). 

 Rio Negro. = Doras cataphractus (Linnaeus). 

 Pasawiri. 7 in. = 1 Doras cataphractus (Linnaeus). 



Upper Essequibo. 5 in. = ? Doras cataphractus 



(Linnaeus). 

 Esmeralda. = Oxydoras niger (Val.). 

 Orooporary on the Essequibo. 



