122 ICHTHYOLOGIA 0HIENS1S 



with brown. Tail marginated. Adipose fins brown. 



[6j~\ 70th Species. Blue Catfish. Pivelodus ceru- 

 lescens. Pimelode bleuatre. 



Upper jaw longer, lateral barbs black, shorter 

 than the gills. Eyes elliptical. Operculum and 

 lateral line flexuose. Body of a bluish lead colour, 

 whitish beneath, unspotted. Tail equally forked, 

 base redish. Anal fin arched with 25 rays. 



Silurus cerulescens. Monogr. sp. 3. 



A fine species, reaching sometimes to a very large 

 size, I have been told that one was taken weighing 

 185 pounds and another 250 pounds. Vulgar names 

 Blue Cat and Brown Cat, or Catfish. It is not 

 uncommon in the lowest parts of the river. Whole 

 shape somewhat fusiform as in all the species with a 

 forked tail, yet depressed forwards and compressed 

 behind. Of an uniform lead colour, nearly blue in 

 the young individuals and nearly brown in the old 

 ones. Barbs rather short and white, the upper ones 

 very short and brown. Iris elongate and whitish. 

 Fins bluish; but the pectoral and abdominal whitish. 

 Spine of the pectoral fins equal in length, not fenes- 

 trate, and hardly serrate inside. Number of rays, 

 dorsal 1 and 6, pectoral 1 and 7, abdominal 6, caudal 

 22. A variety has a blackish tail. Vent posterior. 



71st Species. White Catfish. Pimeloduspallidus. 

 Pimelode pale. 



Upper jaw longer, lateral barbs reaching the pec- 

 toral fins. Eyes elliptical. Lateral line straight. 

 Body whitish, back slightly olivaceous. Tail nearly 

 equally forked. Anal fin elongate with 25 rays. 



Silurus pallidus. Monogr. sp. 2. 



Vulgar names white and channel Catfish : this last 

 name is given to it because it dwells principally in 



