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the channels or deeper parts of the river. Length 

 from one to two feet. Shape as in the foregoing. 

 Head smaller, olivaceous above. Barbs [II. 358] 

 white. Iris white. First dorsal fin nearer to the 

 abdominal fins, yellowish, rays i and 6. Pectorals 

 yellowish, rays i and 7. Abdominals white with six 

 rays. Adipose fin olive with a brown tip. Anal and 

 caudal pale brown, 24 rays in the tail, which has the 

 upper acute lobe slightly longer. It offers some 

 varieties, ist. Marginata. Tail fulvous, margin- 

 ated with black [<5^] 2d. Lateralis. With three 

 black spots on each side. 3d. Leucoptera. All the 

 fins pale and whitish. 



72d Species. Silvery Catfish. Pimelodus argy- 

 rus. Pimelode argyre. 



Jaws nearly equal, lateral barbs brown and reach- 

 ing the pectoral fins. Eyes elliptical. Body silvery, 

 lateral line straight. Fins brownish, anal with 25 

 rays. Tail equally forked. 



Silurus argenteus. Monography, sp. 4. There is 

 another species of that name already. 



A small and rare species, very similar to the fore- 

 going, of which it is perhaps a variety. Number of 

 rays similar. 



2d Section. Leptops. Tail bilobed. Eyes round 

 and very small. Nine abdominal rays. Vent pos- 

 terior. Adipose fins large. 



73d Species. Clammy Catfish. Pimelodus viscosus. 

 Pimelode visqueux. 



Jaws nearly equal, barbs very short, eyes round 

 over the head. Body entirely brown, lateral line 

 raised upwards before. Pectoral fins with i and 7 

 rays, anal fin rounded with 15 rays. Tail unequally 

 bilobed and black, upper lobe smaller and white. 



Silurus viscosus. Monogr. sp. 6 



