FISHES CYPRINIDAE TIGOMA EGREGTA. 



291 



List of specimens. 



4. TIGOMA HUMBOLDTI, Grd. 



SPEC. CHAR. Body ratner short and deep, tapering gradually towards the peduncle of the tail. Head contained a little 

 over four times and a half in the total length. Snout thickish and rounded ; gape of mouth slightly oblique ; posterior 

 extremity of maxillar bone extending to a vertical line drawn within the anterior rirn of the orbit. Eye well developed, sub- 

 circular ; its diameter entering four times in the length of the side of the head. Anterior margin of dorsal fin equidistant 

 between the extremity of the snout and the fork of the caudal. Origin of ventrals equidistant between the extremity of the 

 snout and the insertion of the caudal. Bluish or greyish black above ; yellowish beneath. 



SYN. Tigoma humboldti, GRD. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 206. 



This species resembles T. obesa by a deep and rather short body ; the greatest depth being equal 

 to the third of the length, the caudal fin excluded. The head and eyes are also much larger. 

 The anal fin is somewhat more developed than the dorsal, which is sub-trapezoid, with its upper 

 edge nearly straight, whilst the inferior edge of the anal is sub-concave, and its anterior margin 

 nearer the fork of the caudal than the isthmus, whilst its base enters about eight times in the 

 total length. The ventrals are posteriorly rounded off, extending as far as the vent. The 

 pectorals are likewise broad and rounded posteriorly, but they do not reach the insertion of the 



ventrals. 



D 1, 9 ; A 1, 12 ; C 5, 1, 9, 8, 1, 4 ; V 1, 9 ; P 14. 



The scales are much larger than in T. obesa, and somewhat smaller on the dorsal region in 

 advance of the fin than along the flanks. The lateral line is but slightly deflexed opposite the 

 pectorals, whence it is straight to the tail, somewhat below the mesial line of the flanks. 



The dorsal region above the lateral line is bluish or greyish black, with a yellow or reddish 

 streak from the supra-tympanic region to the peduncle of the tail. The flanks below the lateral 

 line, and the belly, are yellowish. The fins are more or less greyish, upon a yellowish ground. 



List of specimens. 



5. TIGOMA EGREGIA, Grd. 



SPEC. CHAR. Body rather elongated, sub-fusiform in profile. Head contained four times in the length, the caudal fin 

 excluded. Snout sub-conical and thickish ; gape of the mouth slightly oblique ; jaws equal ; posterior extremity of the 

 maxillary extending to a vertical line drawn within the anterior rim of the orbit. Eye moderate sized, sun-circular; its diameter 

 entering four times and a half in the length of the side of the head. Anterior margin of dorsal fin nearer the extremity of the 

 snout than the fork of the caudal. Origin of ventrals equidistant between the insertion of the caudal fin and the extremity 

 of the snout. Bluish black above ; yellowish orange beneath. 



