FISHES — PERCIDAE — POMOTIS AQUILENSIS. 



25 



List of specimens. 



4. POMOTIS AQUILENSIS, B & G. 

 Plate IX, Figs. 1—4, and Plate X, Figs. 8—11. 



Spec. Char. — Body sub-elliptical in profile. Head moderate ; snout bluntly sub-conical. Mouth moderate ; posterior 

 exiremity of maxillary extending to a line intersecting the anterior rim of the orbit. Eye moderete. Edge of the preoperclo 

 slightly denticulated or serrated. Opercular flap variable, oftentimes elongated and well developed. Extremities of pectorals 

 not extending as far back as those of the ventrals wliich overlap the vent and i each the anterior margin of the anal fin. Reddish 

 brown ; fins greyish olive, unicolor ; dorsal and anal provided with a black patch. 



Stn.— Pomofis aquiltnsis, B. & G. Proc. Acad. Nat. Sc. Philad. VI, 1853, 387. 

 Pomolis nefaslus, B. & G. Proc. Acad. Nat. Sc. Philad. VII, 1854, 24. 



This species is also one of those which were first brought home by the United States and 

 Mexican Boundary Commission, to whose Keport we must refer for more ample informations. 

 Subsequent researches have convinced us of the specific identity between P. nefastus and 

 P. aquilensis. The species is one of those subjected to great variations by the outgrowth of 

 various regions of the body. The opercular flap assumes different degrees of development 

 according to the specimens, being larger, of course, in full grown ones than in the young. 

 The individual on Plate IX, fig. 1, is somewhat deformed in the abdominal outline, the snout 

 being at the same time protruding beyond all proportions, giving rise to a conspictious nuchal 

 depression. It comes nearest to the variety which we had formerly described as Pomotis 

 nefastus. The black patches of the dorsal and anal fins are obliterated. 



References to the figures. — Plate IX, fig, 1, represents an outgrown specimen of Pomotis 

 aquilensis, ( P. nefastus,) size of life, procured in the Kio Blanco, Texas. — Fig. 2 is a dorsal 

 scale. — Fig. 3, a scale from the lateral line. — Fig. 4, a scale from the abdominal region. 



Plate X, fig. 8, represents, size of life, a young specimen of the same species, caught in 



Sugar-loaf creek, Arkansas. — Fig. 9 is a dorsal scale. — Fig. 10, a scale from the lateral line. — 



Fig. 11, a scale from the abdominal region. 

 4a . 



