1906.] FRESH- WATER FISHES OF TRIXIDAD. 387 



spots ; fins dusky, the dorsal with a light band along the basal 

 part. ^ 



" Found all over the island, fairly plentiful, sometimes exceeding 

 a foot in length." Here described from two specimens of 180 and 

 200 mm. Known only from Trinidad. 



14. PsEUDAuCHENiPTERUS GUPPYi, sp. n. (Plate XXIV.) 

 " Yellow Catfish." 



Depth of body 4i-4f in the length, length of head 4-4|. Snout 

 not longer than eye, the diameter of which is 4-5 in the length of 

 head and 2-3 in the interorbital width. Head nearly as broad as 

 long ; upper surface, excepting the snout, rugose, not covered by 

 skin ; frontal bones not swollen ; profile rising evenly from snout 

 to dorsal fin. Lower jaw scarcely shorter than upper ; maxillary 

 barbel extending to anterior ^ or middle of pectoral. Dorsal I 6 ; 

 spine serrated posteriorly, as long as head. Anal 21 ; anterior 

 rays longest, in the male thickened and considerably produced. 

 Pectoral spine with serrated inner edge, as long as the head. 

 Ventrals 8-rayed, extending to the origin of anal. Caudal forked. 

 Upper half of body blackish green, with several vertical series of 

 small yellowish-white spots ; lower parts white, anteriorly with a 

 dark longitudinal band ; fins yellow, the dorsal dark at the base, 

 the caudal with a blackish margin. 



Oaroni River. 



Two specimens, 145 and 185 mm. in total length. 



" Caught in numbers, especially where small streams empty 

 themselves into the Oaroni." 



15. Parauchenipterus pase^, sp. n. (Plate XXIII.) 

 " Grouper Cat-fish." 



Depth of body 3^ in the length, length of head 4. Snout as 

 long as eye, the diameter of which is 4| in the length of head and 

 3 in the interorbital width. Head as broad as long ; upper surface 

 rugose, not covered by skin ; interfrontal fontanel oval, continued 

 anteriorly as a narrow groove ; parieto- occipital a little longer than 

 broad, a little longer than its distance from the base of the dorsal 

 spine ; nuchal shield rounded posteriorly, its length equal to that 

 of the basal shield of the dorsal spine (measured in the mid-dorsal 

 line). Lower jaw somewhat projecting ; maxillary barbel extending 

 to anterior ^ of pectoral ; mental barbel extending a little beyond 

 the base of the post-mental, which reaches the base of the pectoral. 

 Dorsal I 6 ; spine smooth except for a median anterior series 

 of nodules, a little more than ^ the length of head. Anal 23, 

 rounded anteriorly and posteriorly, slightly emarginate medianly. 

 Pectoral spine serrated on both edges, nearly as long as the head ; 

 humeral process extending beyond the middle of the pectoral spine. 

 "Ventrals 6-rayed. Caudal obliquely truncate. Yellowish, spotted 

 and marbled with blackish ; belly white, with small greyish spots. 



Oaroni River. 

 Proc. Zool. Soc— 1 906, Vol. I. Xo. XXVI. 26 



