174 CALIFORNIA ACADEMY OF SCIENCES. 



distinct from clarias, and more closely related to macu- 

 latus than to clarw*. 



The piscatrix Cope, and macrospila Gunther, should 

 also be referred to this species. 



The Mystus No. 84 Gronow was referred successively 

 by Valenciennes to clarias, by Giinther to maculatus, 

 and by Bleeker to macronema. 



GENERAL DESCRIPTION. 



Body robust, especially in older specimens; head coni- 

 cal, its greatest depth 2, its greatest width 1| in its length; 

 the ossification of the head exposed, granular; occipital 

 process arched transversely, its width at the base -f its 

 length. 



Maxillary barbel, terete extending beyond the tips of 

 the dorsal; mental and postmental barbels almost equi- 

 distant from each other, the mentals about reaching to 

 the pectoral; the postmentals beyond the middle of the 

 pectorals. 



Mouth moderate, its width at the angles 2J to 3J in 

 the length of the head; the lower jaw is included, the 

 upper bordered by a broad lip. 



Teeth in lower jaw in bands which taper to a point 

 behind the rictus, interrupted in the middle; teeth of 

 the upper jaw in a narrow uninterrupted band; some- 

 times minute patches of teeth on the vomer, some- 

 times larger patches on the pterygoid bones. 



Gill-membranes separate to in front of eye; gill-rakers 

 6+19. 



Adipose dorsal short, 3J to 5 in the length. 



Caudal divided to near its base. 



Anal emarginate, the fourth ray highest, extending 

 beyond the tip of the last ray. 



Ventrals short and broad, extending -i of their length 

 beyond the vent. 



