14 
U. S. P. R. R. EXP. AND SURVEYS-ZOOLOGY-GENERAL REPORT. 
the dorsal and anal fins exhibit a black spot or patch at the base of their posterior margin. 
Black dots are scattered all over the body, but may not occur in all the specimens. The 
pectoral fins are of a light olive ; the ventrals, olivaceous upon their base, are greyish towards 
their extremities. The other fins are greyish olive. 
References to the figures .—Plate IY, fig. 1, represents Calliurus diaphanus, size of life. 
Fig. 2, 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. 
a 
o, 
r6 
-S 
1 
$3 
g 
bo ^ 
o q 
8 I 
Locality. 
o 
Whence and how obtained. 
*3 
Nature of speci¬ 
men. 
Collected by— 
o 
1 
6 
-o *3 
a 
q 
& 
s 
.S 
•a 
o 
374 
Rio "Blanco, Tex_ _ 
1852 
Lt. Whipple. 
23 
Alcoholic_ 
Dr. Kennerly . 
3. CALLIURUS FORMOSUS, Grd. , 
Plate V, Figs. 1—4. 
SrEC. Char —Mouth large, gape oblique upwards. Posterior extremity of maxillary extending to a vertical line passing 
beyond the middle of the pupil. Eye moderate. Insertion of ventrals situated under the base of pectorals and a little 
posteriorly to the anterior margin of the dorsal, their tips reaching the vent. Scales moderate. Reddish brown above, 
spotted with black ; greyish beneath. Soft portion of dorsal and anal fins provided with a black patch. 
Syn .—Calliurus formosus, Grd. in Proc. Acad. Nat. Sc. Philad. November 1857. 
This species, we venture to say, will prove very closely allied to, if not identical with, 
C. punctulatus of Rafinesque. But not being able to establish the fact with any degree of 
certainty, we send it forth under the above appellation. 
The general form of the body is intermediate between that of C. melanops and G. diaphanus. 
Proportionally as deep anteriorly as C. melanops , it tapers much more rapidly backwards. The 
cleft of the mouth and the extension of the maxillary bone resemble C. diaphanus most. The 
eye is smaller than in either, of the preceding species. 
The greatest depth of the body, measured upon the thoracic region, is a little more than the 
third of the entire length, and a little greater also than the length of the head. The nape is 
quite convex, and the upper surface of the head very declivous. The head itself constitutes a 
little less than the third of the length. The upper jaw, though longer than the upper, is less 
protruding than in O. melanops and C. diaphanus. The gape of the mouth is less oblique 
upwards, and the posterior extremity of the maxillary extends to a vertical line which would 
pass posteriorly to the middle of the pupil. The tongue is broad, fleshy, and toothless. The 
eye is of moderate size, sub-circular in shape ; its diameter entering five times in the length of 
the side of the head. 
The spinous portion of the dorsal fin is lower, or else less arched in its upper outline, than 
in the two preceding species, whilst the soft portion of the same fin is even more developed than 
in G. diaphanus ; the posterior extremities of the longest rays being even with those of the 
anal, and reaching a vertical line which would intersect the insertion of the caudal. The 
caudal itself is but slightly emavginated posteriorly, and enters about five times and a half in 
