FISHES — CYPRINIDAE — LEUCOSOMUS PALLIDUS. 



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The color is uniform greyish brown above, silvery along the middle of the flank, and dull 

 yellowish beneath ; the fins heing of a greyish olive tint. 



2. LEUCOSOMUS PALLIDUS, G r d, 

 Plate LXI, Figs. 6 — 10. (By error: Leucosomus macrocephalus.) 



Spec. Char.— Head moderate sized, rather elongated, entering four times and a-half in the total length. Snout sub-conical 

 and tapering. Eye moderate ; its diameter being contained five times in the length of the side of the head. Gape of mouth 

 somewhat oblique ; posterior extremity of the ma.xillary extending to a vertical line intersecting the anterior rim of the pupil. 

 Anterior margin of dorsal fin nearer the insertion of the caudal than the extremity of the snout. Insertion of ventrals situated 

 somewhat in advance of the anterior edge of the dorsal. Greyish brown above, yellowish white beneath ; a black spot at the 

 base of the caudal and anterior edge of the dorsal fin. 



SvN. — Leucosomus pallidus, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 190. 



This species has the same general physiognomy as L. disbimilis. The scales of the back are 

 likewise a good deal smaller than on the flanks, but in totum they are larger than in the pre- 

 ceding species. The origin of the ventrals is likewise situated in advance of the anterior margin 

 of the dorsal. The caudal fin is not so deeply furcated as in L. dissimilis. The dorsal and 

 anal fins are deeper than long ; they are of but moderate development, as well as the ventrals 

 and the pectorals ; the tips of the ventrals scarcely approximating the vent. 

 D 1, 8 + 1 ; A 2, 8 + 1 ; C 7, 1, 9, 8, 1, 8 ; V 1, 8 ; P IT. 



The scales moderate sized, somewhat smaller on the hack than on the sides ; sub-circular in 

 outline, with radiating furrows upon their posterior section only. 



The dorsal region is greyish brown, the ventral region yellowish white. A black spot may 

 be observed at the base of the caudal, and another upon the anterior margin of the dorsal. 



References to the figures. — Plate LXI, fig. 6, represents Leucosomus pallidus, size of life. 

 Fig. 7 is a section of the body across the line of greatest depth. Fig. 8, a scale of the dorsal 

 region. Fig. 9, a scale from the lateral line. Fig. 10^ a scale from the abdominal region. 



List of specimens. 



