154 On a new Siluroxd Fish from Brazil. 



Leuciscus smyrnceus. 



Section Squalius, Heck. Pharyngeal teeth 5 . 2. Deptli 

 of body 3 to 3^ times in total length, length of head 3^ to 3| 

 limes. Mouth oblique ; snout 1^ as long as the eye in the 

 adult ; eye 4 to 5 times in length of head, interorbital width 

 2^ to 2f times. Dorsal 11 7, originating just behind the 

 vertical of the ventral and nearly midway between the end of 

 the snout and the extremity of the caudal fin. Pectoral 

 nearly | length of head. Anal III 7-8. Caudal forked. 

 Scales 33-35 | : 2 scales between lateral line and base of 

 ventral. Dark olive to blackish above, silvery beneath ; rays 

 of paired fins and anal bright yellow. 



Total length 160 millim. 



Several specimens. 



XXIII. — Description of a new Siluroxd Fish from the Organ 

 Mountains, Brazil. By G. A. Boulenger, F.R.S. 



Trichomycterus Goeldii. 



Head much depressed, as long as broad, six times in total 

 length ; eye small, midway between end of snout and oper- 

 cular border, its diameter half interorbital widtli ; upper 

 maxillary barbel reaching the pectoral; gill-membranes nar- 

 rowly joined to the isthmus, extending forward to below the 

 eyes. Body as deep as broad ; caudal peduncle strongly 

 compressed, twice as long as deep. Dorsal wnth 10 rays, 

 opposite to the space between ventrals and anal, twice as 

 distant from the end of the snout as from the caudal ; anal 

 with 7 rays. Pectorals with the outer ray produced, filiform. 

 Ventrals equally distant from the end of the snout and the 

 posterior border of the caudal fin ; latter rounded. Yellowish, 

 with ill-defined brown spots above. 



Total length 99 millim. 



This fish, which is nearest allied to T. punctatissimus , 

 Casteln., and T. Knerii, Stdr., is found in brooks at Colonia 

 Alpina, in the Province Rio Janeiro, at an altitude of nearly 

 2600 feet. I am indebted to Dr. E. A. Goldi and his cousin 

 Mr. Andreas Goldi for a set of the fishes of that locality, 

 which appears to produce but six species. These are, in 

 addition to the one described above : — Heros acaro'idesy Hens. ; 

 Flecostomus microps, Stdr. ; Characidium fasciatum, Reinh. ; 

 I'etragonopterus fasciatus, Cuv. ; and XipJiorhamphus hepsetus, 

 Cuv. 



