43 1 Dr. R. Philippi on the River-Fishes of Chili. 



brown round dots, which, however, are absent from the fins; 

 the lower surface of the head and the belly as far as the tail are 

 white, as are also the ventrals and anal. The pectoral is 

 remarkably broad, and blackish at the base. Both lips are 

 thickly beset with tolerably large wart-like papillae, very much 

 as in Arius carcharias. All the lower barbels are of equal length, 

 as long as the opening of the mouth, and whitish. Length of 

 the fish 118 millim., of the head 18^ millim. ; greatest height 

 15 millim.; height of the tail 9 millim. Number of rays in 

 the fins :— D. 10 ; A. 6; P. 8 ; V. 5. 



12. Trichomycterus pallenSy Ph. 



This species also is easily distinguishable by its colouring: 

 it is of a pale reddish white, after having been kept a long time 

 in spirit, and the fins are quite colourless ; what the colour may 

 have been during lifetime I am unable to say. The sides of 

 the body present, as in the foregoing species, and as, indeed, in 

 so many fishes, an inconspicuous darker longitudinal streak. 

 The lips are completely smooth ; the maxillary barbels are 

 longer than the nasal ones, and the longest reach quite to the 

 opercular margin. The spines of the suboperculum are very 

 strong as compared with the small size of the fish. The largest 

 specimen measures only 72 millim., of which the head is 11 

 millim.; the breadth of the head is 14 millim., its heights 

 millim..; greatest height of the body 12 millim., that of the 

 tad 8 millim. Number of rays in the fins ; — D. 9 or 10; A. 6; 

 P. 8;V. 5. 



13. Nematogenys inermis, Girard, U. S. N. A. Exp. p. 240, 



t. xxxii. f. 1-3. 

 Trichpmycterus inermis, Guichenot in Gay, ii. p. 312, tab. 9. f. 2. 

 I possess several specimens, which correspond exactly in colour 

 &c. with the figure given by Gay. 



14. Nematogenys nigricans. Ph. 



This fish is anteriorly almost entirely black above ; the tail 

 presents a rather bright yellowish ground, which is varied with 

 black spots. The inferior surface is white anteriorly, varied with 

 blackish spots on the sides, and with a short blackish stripe 

 with white spots ; the hinder half is entirely blackish. The 

 dorsal and caudal are blackish, as also the upper surface of the 

 pectoral; the ventrals and anal are white, with blackish spots; 

 the entire body is thickly beset with papillae, which arc largest 

 upon the lips. The barbels at the angle of the mouth do not 

 reach to the root of the pectoral. The size and proportions of 

 the body are the same as in N. inermis; I do not, however, 

 believe this to be a mere colour variety. 



