

ICHTHYOLOGY. 



33 



pair extending beyond the base of the pectorals ; the inner mental pair being shorter than the 

 external one. The supra-nasals are the smallest, and when lying over the surface of the head 

 they extend as far back as a line drawn from one pupil to the other. 



D I, 6 ; A 35 ; C 6, 1, 8, 7, 1, 6 ; V 8 ; P I, 10. 



The color is reddish brown above, silvery white beneath, occasionally marked with small 

 sub-circular black spots. The fins being uniformly olivaceous or greyish. 



XVI, fie. 



to 



# 



reduced in size ; fig. 2, is an 



outline of the same fish seen from above ; and, fig. 3, the head seen from beneath. 



XVII 



its specific characters, and particularly interesting as compared to the 



following 



o 



XVIII 



species 



List of specimens. 



Catal. 

 No. 



837 



838 



No. of 

 spec. 



10 



7 



Age 



Locality. 



Adult. . 

 • .do* • • 



When 

 collected 



Mouth of Rio Grande del Norte 



Brownsville, Texas 



1854 



1851 



Whence obtained. 



Maj. Emory 



Capt. Van Vliet. 



Nature of 

 specimens. 



Collected by 



Alcoholic. 



• • « «GO • • « • 



Jno. H. Clark. . . 

 Capt. Van Vliet. 



2. PIMELODUS VULPES, Grd. 



Plate XVIII. 



Spec. Char. — Tn its general aspect this species resembles the preceding one, from which it differs chiefly by a shorter and 

 deeper anal fin, smaller spines at the anterior margin of the dorsal and pectorals, and, perhaps, a caudal less deeply furcated. 

 The ventrals are rather short and broad, being also inserted further apart from the origin of the anal, since their posterior 

 extremity extends to the anterior edge of the latter fin and no further. The posterior extremity of the adipose fin is nearly even 

 with the terminus of the anal. The head enters about five times in the total length ; the mouth being larger than in P. qffinis. 



The color of the dorsal region is of a greyish black or slate hue, somewhat lighter on the 

 flanks and beneath. Small, sub-circular, black spots may sometimes be observed scattered over 

 the body. The fins, as usual, being unicolor. 



D I, 6 ; A 23 ; C 5, 1, 8, 7, 1, 6 ; V 8 ; P 1, 8. 



XVIII 



List of specimens. 



CataJ. No. of 



No. 



843 



844 

 845 



846 

 847 

 848 

 849 



spec 



9 



I 

 6 

 4 

 1 

 1 

 2 



Age 





YoUnnr 





Locality. 



Camanche Spring, Texas 

 Rio Salado, Texas 



When 

 collected. 



Live Oak creek, Texas 



Camanche Spring, Texas. . . . » . 

 Rio Leona : Nueces, Texas. .. . 



Piedra Painte, Texas 



Devil 's river, Texas 



1854 

 1851 

 1851 

 1851 



IS5I 



1851 



1851 



Whence obtained 



Orig. Nature of Collected by 

 No. specimens. 



Major Emory 



Col. J. D. Graham 



do 



do 



do 



90 Alcoholic. Dr. C. B. Kennerly 

 do ... . John H . Clark 



d 



o 



do 



do 



CO 



do 



do 



■du 



do 



do 



do 



do 



do 





5 



l 



