1906.] FRESH-^YATER FISHES OP TRINIDAD. 389 



a pair of barbels which are shorter than the diameter of eye ; 

 barbels at the angle of the mouth extending to the base of 

 pectoral fin. Exposed parts of the coracoids widely separated 

 below. Scutes ^q, 2 or 3 unpaired ones in front of the spine of 

 the adipose fin. Dorsal I 7 ; spine i-| the length of head ; 

 anterior^ branched rays longest, | the length of head. Anal I 6, 

 when laid back extending to base of caudal. Pectoral spine with' 

 serrated inner edge, extending nearly to or a little beyond the 

 base of ventral. Caudal forked. Caudal peduncle much deeper 

 than long. Head and upper part of body dark greenish ; lower 

 parts abruptly lighter ; fins pale yellow, the dorsal and caudal 

 more or less dusky. 



Here described from 5 specimens, 65 mm. in total length, from 

 Trinidad and Grenada. This fish has not yet been recorded from 

 other localities. 



20. Plecostomus guacari Lacep. 

 Hah. Paraguay to Venezuela. 



21. Plecostomus robini C. & V. 

 Hah. Montevideo; Trinidad. 



22. Ancistrus trinitatis Gthr. 



This little-knov^Ti species may prove to be allied to A. hachi 

 Bouleng. Apparently Liitken had a specimen of another species 

 of this genus from Trinidad, which may be related to A. mega- 

 cephalus Giinth. 



. 23. Xenocara cirrhosum C. & Y. 

 " Bearded Teta." 

 Hob. Paraguay to Yenezuela. 



24. Symbran^chus marmoratus B1. 

 " Eel " or " Zangie." 



" They live in holes or under rocks or buried in the mud and 

 come out in search of prey, especially after heavy rain. They 

 lie among the dead leaves at the bottom of the pools and grab at 

 the small fry as they pass. During the wet season they may 

 often be seen lying perfectly still at the bottom of the pools. 



" Colour : greenish or yellowish, spotted with brownish." 



Hah. Tropical America. 



25. Haplochilus harti Blgr. (Plate XXI. fig. 2.) 

 " Small Guabin." 



Depth of body ^-^ in the length, leng-th of head 3|-4. 

 Snout a little shorter than eye, the diameter of which is 

 3i-3| in the length of head, interorbital breadth l|-2. Maxil- 

 lary not extending to below the eye; jaws equal anteriorly; 



26* 



