FISHES-CYPRINIDAE—DIONDA SPADICEA. 
229 
Besides the other peculiarities of structure above alluded to, this species may readily he 
distinguished from all its congeners by its scales being the smallest so far observed in the genus. 
The diameter of the eye does not enter quite four times in the length of the side of the head : 
once, in advance of the anterior rim of the orbit. The isthmus is rather wide and the opercle 
quite developed. The scales themselves are somewhat variable in their aspect, those of the back 
and belly being nearly as long as deep, though posteriorly attenuated ; whilst in the lateral 
line they are deeper than long and sub-elliptical; radiating furrows existing upon the posterior 
section alone. 
The color is greyish above and whitish or yellowish beneath ; the base of the caudal fin 
exhibits a black spot. The sides and under surface of the head being silvery. 
References to the figures .—Plate LII, fig. 21, represents Dionda plumbea, size of life. Fig. 22 
is a section of the body across the line of its greatest depth. Fig. 23, a scale from the dorsal 
region. Fig. 24, a scale from the lateral line. Fig. 25, a scale from the abdominal region. 
List of specimens. 
Catal. 
No. 
Cor’g 
No. of 
teeth. 
No. of 
spec. 
Locality. 
When 
collected. 
Whence obtained. 
Orig’l 
No. 
Nature of 
specimen. 
Collected by— 
35 
2649 
i 
Head waters of Canadian 
river (Llano Estacado). 
1853 
Lt A. W. Whipple. 
VIII. 
Alcoholic. 
H. B. Mollhausen_ 
4. DIONDA SPADICEA, G r d . 
Plate LII, Figs. 26—30: 
Spec. Char. —Body slender and sub-fusiform, compressed. Head sub-conical, constituting about the sixth of the total 
length. Gape of mouth very slightly arched, its angle not reaching a vertical line drawn in advance of the orbit. Eye mode¬ 
rate, sub-circular. Caudal entering about five times in the total length. Insertion of ventrals situated under the anterior 
margin of the dorsal. Scale moderate sized, somewhat longer than deep. Reddish brown above ; dull whitish beneath, with a 
black spot at the base of the caudal. 
Syn. —Dionda spadicea, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 178. 
The head and body by their slender appearance give this species the general aspect of the 
preceding one. The head, however, is more conical and the eye smaller, the diameter of the 
latter entering four times in the length of the side of the head. The scales are somewhat 
larger than in D. plumbea, being also longer than deep, anteriorly sub-truncated, posteriorly 
rounded, with radiating furrows upon the posterior section alone. The color is reddish brown 
above and whitish beneath; the base of the caudal exhibiting a black spot. 
References to the figures —Plate LII, fig. 26, represents Dionda spadicea , size of life. Fig 27 is 
a section of the body across the line of greatest depth. Fig. 28, a scale from the dorsal region. 
Fig. 29, a scale from the lateral line. Fig. 30, a scale from the abdominal region. 
List of specimens. 
Catal. 
No. . 
Cor. No. 
of teeth. 
No. of 
spec. 
Locolity. 
When 
collected. 
Whence obtained. 
Nature of 
specimen. 
Collected by— 
34 
2648 
3 
Fort Smith, Ark.. _ 
1853 
Lt. A. W. Whipple. 
Alcoholic. 
H. B. Mollhausen_ 
