LIST OF FISHES COLLECTED BY THE MULFORD EXPE- 
DITION IN BOLIVIA 
ORDER NEMATOGNATHI. 
Family Aspredinhle. 
Bunocephalus bifidus Eigenmann MS. 
15413, 2, 42 and 45 mm., Lagoons, Lake Rogoagua. Nov., 1921. 
15414, 1, 31 mm., Lagoons, Lake Rogoagua. Nov., 1921. 
No. 15414 is immature and probably belongs here. It was 
collected at the same time and place as the specimens 15413. 
This species is known only from the types from Yurimaguas, 
Peru. 
Family SiLURlDiE. 
Subfamily pimelodin^e. 
Pterogianis Eigenmann & Pearson, gen. nov. 
Characterized by its long, wide pectorals, which give it the 
appearance of a flying fish. 
Head broad, mouth very wide, origin of maxillary barbel 
some distance in front of the angle of the mouth ; two pairs of 
mental barbels ; outer mentals about 2 times the inner ; a 
thin membrane from anus to anal and from anal to caudal ; 
pectorals extending slightly beyond tip of the ventrals ; cau- 
dal lobes very long. 
Pterogianis manni Eigenmann & Pearson, sp. nov. Plate I, 
fig. 1. 
16001, 1, 21 mm. to base of caudal, Little Rio Negro, tributary to the 
Beni. Jan., 1921. Collector, W. M. Mann. 
Of its capture Dr. Mann writes: 
I saw the thing when I was in a canoe among the trees in an in- 
undated portion of the shore. It was resting an inch or so below the 
surface with the pectoral fins outstretched so that it looked as much like 
something else as it did like a fish. I grabbed at it to see what it was 
and it sank quickly, but floated upward again after a moment or two, 
when I got it by slipping a clam shell, which I had in the boat, beneath 
it and lifting it out. 
Having only one specimen and not wishing to mutilate it 
any more than necessary we have been unable to determine 
'( 9 ) 
