FISHES—PERCIDAE—POMOTIS AQUILENSIS. 
25 
List of specimens. 
Catalogue number. 
No. of specimens. 
j Sex and age. 
Locality. 
When collected. 
Whence obtained. 
J Original number. 
Nature of 
specimens. 
Collected by— 
438 
4 
Adult.. 
Rio Cibolo, Texas_ 
1851 
Col. J. D. Graham. 
John H. Clark .. 
439 
1 
. _ do. .. 
Rio Nueces, Texas. 
1856 
Capt. John Pope .. 
__ .do_ 
Captain Pope_ 
440 
8 
Young. 
Dry Creek, near Victo- 
ria, Texas_ 
1854 
Major Emory_ 
54 
_do. 
Dr. Kennerly ... 
441 
1 
-- do_ 
Dry Creek, near Victo- 
ria, Texas_ 
1854 
_do_ 
56 
_ .do.. 
_do.... 
442 
7 
-- do_ 
Dry Creek, near Victo- 
ria, Texas_,_ 
1854 
___do_ 
53 
___do. 
443 
12 
-- do. 
Rio San Juan, and near 
Cadereita, N. L._ 
1852 
Lieut. Couch_ 
15 & 19 
_do. 
Lieut. Couch_ 
444 
1 
Rio Blanco, Texas_ 
1853 
20 
do_ 
Dr. Kennerly_ 
445 
4 
Fort Bliss, N. M_ 
1857 
Dr. S. W. Crawford, 
D. S. A.. 
-do. 
Dr. Crawford ... 
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 
extremity of maxillary extending to a line intersecting the anterior rim of the orbit. Eye moderete. Edge of the preopercle 
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 which overlap the vent and leach the anterior margin of the anal fin. Reddish 
brown ; fins greyish olive, unicolor ; dorsal and anal provided with a black patch. 
Syn.— Pomotis aquilensis, B. & G. Proc. Acad. Nat. Sc. Philad. VI, 1853, 387. 
Pomotis nefastus, 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 Report 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 conspicuous 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 Rio 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. 
4 a 
