Pearson: Fishes of the Rio Beni Basin 
15 
Pimelodella griffin! Eigenmann. 
17083, 14, 65-100 mm., Tumupasa. Dec., 1921. 
Only the males have the filamentous dorsal ray. 
Pimelodella laticeps australis Eigenmann, 
17086, 13, 88-145 mm., Rio Colorado, Lower Bopi. Sept., 1921. 
17095, 5, 92-110 mm., Popoi River, Upper Beni. Sept., 1921. 
The above specimens agree with the description of the types. 
I had no specimens for comparison. All have the dorsal 1.6. 
Sorubim lima (Bloch & Schneider) . 
17043, 1, 310 mm., Rurrenabaque. Oct., 1921. 
17044, 1, 350 mm., Lake Rogoagua. Oct., 1921. 
Subfamily AUCHENIPTERINA3. 
Trachelyopterus coriaceus (C. & V.). 
17034, 12, 112-140 mm., Reyes. Nov., 1921. 
Trachycorystes galeatus (L.). 
17035, 3, 212-230 mm., Lake Rogoagua. Oct., 1921. 
Trachycorystes ceratophysus (Kner). 
17276, 1, 132 mm., Reyes. Nov., 1921. 
Auchenipterus nuchalis (Spix). 
17042, 3, 190-238 mm., Pena Colorado, Huachi. Sept., 1921. 
Family DoRAdhle. 
Platydoras costatus (Linnseus) 
17041, 2, 202 and 225 mm., Lake Rogoagua. Oct., 1921. 
Amblydoras haitcockii (C. & V.). 
17040, 17, 60-98 mm., Lagoons near Reyes* Oct., 1921. 
Family Astroblepidal 
Astroblepus longiceps Pearson, sp. nov. Plate II, fig. 5. 
17357, 13, type and paratypes, the largest the type, 24-56 mm., Rio 
Colorado, Lower Bopi. Sept., 1921. 
15069, 42, 20-58 mm., Yanahuana River, Cerro de Pasco, Peru. Dec., 
1918. Collector C. H. Eigenmann. 
