384 MR. 0. TATE REGAN ON [Apr. 10, 



65 mm. in total length, one received from the Copenhagen 

 Museum as T. ti'mitatis*. Gill's description of T. tceniurus is, 

 so far as it goes, perfectly applicable to T, trinitaiis, and there 

 can be bvit little doubt of their identity. This species is known 

 only from Trinidad, 



5. Tetragonopterus guppyi, sp. n. (Plate XXI. fig. 1.) 

 " Mountain-stream Sardine." 



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

 Snout shorter than eye, the diameter of which is 3-3i in the 

 length of head and less than the interorbital width. Maxillary 

 extending a little beyond the vertical from the anterior margin 



of eye, with a series of small teeth. Scales 38-40 ;^t^, 5^ to 6| 

 between lateral line and root of ventral fin ; lateral line complete. 

 Dorsal 10, with 8 branched I'ays, its origin a little nearer to tip 

 of snout than to base of caudal ; anterior rays longest, shorter 

 than the head. Anal 29-32, with 26 to 29 branched rays. 

 Pectoral extending to or a little beyond the base of venti'al ; 

 ventrals originating in advance of the dorsal, extending nearly to 

 the anal. Caudal forked. Caudal peduncle as long as deep. 

 Silvery, back dark greenish ; traces of a dark humeral spot ; a 

 blackish longitudinal band on the middle caudal rays ; caudal 

 lobes yellow. 



Five specimens, 65-85 mm. in total length. 



This species is allied to the pi-eceding and also to T. tvappi Cuv. 

 & Val., which has a much larger head. 



" Found in clear pebbly brooks with rapid current and plentiful 

 in the Glenside Estate Stream, at the foot of the IsTorthern Range 

 of hills." 



6. Tetragonopterus maculatus L. 

 " Pink-finned Sardine." 



" By far the commonest of the Sardines ; they swarm in the 

 Maracas River, which is clear and at times very rapid. 



" Colour : Silvery, back darker ; a dark humeral spot and a 

 blackish spot at the base of caudal ; fins bright pink." 



Hab. Brazil ; Guiana ; Venezuela. 



7. Tetragonopterus (Hemigrammus) unilineatus Gill. (Plate 

 XXII. fig. 5.) 



" Sardine Dor6e." 

 Depth of body 2|-2| in the length, length of head 4. Snout 

 much shorter than eye, the diameter of which is 2 ^ in the length 

 of head and slightly greater than the interorbital width . Maxillary 

 extending slightly beyond the vertical f]'om the anterior margin of 

 eye, with a series of minute teeth. Scales 32-35 p^,, 4|-5| be- 

 tween lateral line and root of ventral fin ; lateral line on 9 to 12 



* LiitLen, Vid. Medd. 1874, p. 234. 



