FISHES-PERCIDAE — CALLIURUS F0RA10SUS. 
15 
the total length. The insertion of the ventrals takes place opposite the inferior margin of the 
base of the pectorals, and a little posteriorly to the origin of the dorsal ; their tips overlap the 
vent, which is situated near the origin of the anal fin. The pectorals are subovate, of 
moderate development, and extending as far hack as the ventrals. 
Br. VI: VI; D X, 11 ; A III, 9 ; C 3, 1, 8, 7, 1, 4; V I, 5 ; P 13. 
The external spiny ray of the ventral fins is rather slender and acute, closely approximating 
the first soft ray, and apparently confounded with it, upon a superficial examination. 
The scales are moderate in their development, a little deeper than long, with radiating 
furrows upon their anterior section, and so very deciduously pectinated that the serratures fall 
off in the handling of the specimens. They are considerably smaller upon the nape and dorsal 
region generally than towards the flanks, and a good deal smaller also upon the cheeks than 
upon the opercular apparatus. Under the throat their size is likewise reduced. The caudal 
and the soft rays of both the dorsal and anal fins are provided upon their base with exiguous 
and irregularly shaped scales. 
The upper region of the head and body is reddish brown ; the dorsal region, the middle of 
the flanks, and the side of the head being spotted with black. Beneath, the color is uniformly 
greyish. The dorsal and anal fins exhibit a large black patch at the base of their posterior 
margin. The fins otherwise are greyish olive, the external margin of the dorsal, caudal, and 
anal being yellowish white, whilst the ventrals and pectorals are unicolor—the former yellowish, 
the latter greyish. The black patch at the posterior portion of the opercle is surrounded by a 
yellowish or whitish ring. 
References to the figures .—Plate V, fig 1, represents Caltiuriis formosus , size of life. Fig. 2 is 
a scale from the dorsal region. Fig. 3, a scale from the lateral line. Fig. 4, a scale from the 
abdominal region. 
List of specimens. 
Catalogue number. 
Corresponding No. 
of 
No. of specimens. 
Sex and age. 
Locality. 
When collected. 
Whence obtained. 
Original number. 
Nature of specimens. 
Collected by— 
375 
1 
Adult. 
Tributary of Gypsum creek, 
1853 
Lieut. Whipple_ 
XV. 
Alcoholic. 
H. B. Mollhausen. 
Canadian. 
376 
1 
Headwaters of Brazos 
1853 
Captain Pope. 
river. 
377 
7 
1853 
378 
2 
1853 
379 
1 
Headwaters of Colorado, 
1853 
_do_ 
Texas. 
380 
1 
1853 
_do„ 
381 
1 
Fort Washita, Red river 
1853 
_ _ do___ 
_do__ 
...---do_ 
382 
1 
Fort Smith, Arkansas_ 
1853 
do_ 
Dr. Shumard. 
420 
6 
1853 
_ „do. „ _ a -__ 
.„.do_ 
H. B. Mollhausen. 
419 
6 
Rio Brazos......_ 
1853 
Dr. Skumard_ 
...do_ 
Dr. Shumard. 
