54 CALIFORNIA ACADEMY OF SCIENCES. 



23. Tridens brevis sp. nov. 



Type, No. 8160; one specimen .021 m. Tabatinga. Bourget. 



Body short and deep. Head as broad as long. Mouth 

 broad, inferior. Opercle with a bunch of six or more 

 spines. Barbels well developed, the outer one extending to 

 the base of the pectoral, the inner to the gill-opening. Eye 

 large, nearer end of opercle than tip of snout. 



Distance of dorsal fin from tip of caudal little more than 

 2 in the length. 



Anal inserted very little in front of the dorsal and extend- 

 ing some distance beyond it, its rays decreasing in height 

 toward the caudal. First pectoral ray greatly produced. 

 Caudal emarginate. 



Yellowish; blackish dots along the bases of the fins; a 

 series of blackish dots along the middle line of the sides, 

 similar spots on the back. Head with brown dots. 



Head 6; depth 8; D. 9; A. 22. 



VI. PSEUDOSTEGOPHILUS gen. nov. 

 Type, Stegopldlus nemurus Giinther. 



Caudal widely forked. Mouth inferior, each jaw with 

 series of fine teeth, upper lip with several series of fine 

 movable teeth. No teeth on the vomer. Maxillary barbel 

 single; gill membrane confluent with the skin of the isth- 

 mus. Opercle and preopercle armed. 



24. Pseudostegophilus nemurus (Giintber). 



Locality: ? Moranou or Ucayale. 



VII. Stegophilus Eeinhardt. 



25. Stegophilus maculatus Steindachuer. 



26. stegophilus punctatUS Boulenger. 



27. stegophilus intermedius sp. nov. 



Type, No. 9842; one specimen .08 m. Goyaz. Senhor Honorio. 



Elongate, compressed behind, depressed forward; head 



