10 



UNITED STATES AND MEXICAN BOUNDARY. 



Amongst other fresh water percoids collected by the Commission we have further to mention 

 Calliurus melanops, Grd., as having been collected in 1854 by Dr. Kennerly, in the Dry creek 

 Texas, and in San Pedro creek, Texas, 



\omus 



Bravo) 



Family ETHE0ST0MIDAE. 



Exclusively limited to the fresh waters of the northern portion of the western hemisphere, the 

 fishes of this family have not yet been made the subject of any researches beyond the establish- 



Their intimate structure, by which 



ment of some genera and the naming of sundry species. 



future 



long, to be able to undertake. The materials on hand are already very numerous* 



PILEOMA CARBONAKIA, B. & G. 



Plate VIII, Figs. 10—13. 



Spec. Char. — Body elongated, sub-fusiform, compressed ; peduncle of the tail slightly contracted upon its middle. Head 

 constitution about the fifth of the total length ; snout sub-conical ; posterior extremity of maxillary extending to a vertical line 

 drawn in advance of the anterior rim of the orbit. The eye is well developed, sub-circular in shape, its diameter being contained 

 four times and a half in the length of the side of the head. The anterior dorsal is longer than high, and approximates closely 

 the second dorsal, which is somewhat higher than the first, and likewise longer than high. Two short spines may be observed at 

 the anterior margin of the anal fin. The posterior margin of the caudal is sub-concave. The ventrals, inserted somewhat in 

 advance of the anterior margin of the dorsal, are sub-lanceolated and their extremities extend further back than those of the 

 pectorals. The pectorals themselves are rather broad and sub-elliptical. 



Syn. — Pileoma carbonaria, B. & G. in Proc. Acad. Nat. Sc. Philad. VI, 1853, 387. 



The scales are nearly as long as deep, anteriorly sub-truncated with radiating furrows, whilst 

 their posterior edge is rounded and provided with largely developed spines or pectinations. 



Br. VI: VI; D XV, 13; All, 9; C3, 1, 8, 7, 1, 2; VI, 5; P 13. 



The ground color is reddish yellow with transverse bars of black. A black spot may be seen 

 at the base of the caudal, which is barred. The base of the dorsals, the anal, and the ventrals, 

 is black also. The pectorals being unicolor. 



Plate VIII, fig. 10, represents Pileoma carboriaria, size of life ; fig. 11 is a scale from the 

 dorsal region ; fig. 12, a scale from the lateral line; and, fig. 13, a scale from the abdominal 



region. 









List of specimens. 









Catal . 

 No. 



No. of 

 spec. 



• 



. .. 



7 

 1 

 1 



Age. 



Locality. 



• • • • 



When col- 

 lected. 



1851 



1851 

 1854 



Whence obtained. 



Nature of 

 specimen. 



Collected by- 





740 



Adult. 



. . .do . . 

 . . .do.. . 



Rio Salado, Texas.. 

 i Rio Medina, Texas 



Col. J. D. Graham ... 



Alcoholic . 



Jno. H. Clark . 





741 





742 



San Pedro creek, Texas.. 







Dr. C.B.Kennei 



rly ♦ • * • 



