FISHES-CYPRINIDAE 
IGOMA EGREGTA. 
291 
List of specimens. 
Catal. 
No. 
Cor’g No. 
of teeth. 
No. of 
spec. 
Age. 
Locality. 
When col¬ 
lected. 
Whence obtained. 
Nature of 
specimens. 
Collected by— 
215 
2773 
3 
A.&Y. 
Salt Lake valley, Utah.. 
1852 
J. Soule Bowman... 
Alcoholic. 
J. S. Bowman. 
4. TIGOMA HUMBOLDTI, Grd. 
Spec. Char. —Body rattier short and deep, tapering gradually towards the peduncle of the tail. Head contained a little 
over four times and a half in the total length. Snout thickish and rounded ; gape of mouth slightly oblique ; posterior 
extremity of maxillar bone extending to a vertical line drawn within the anterior rim of the orbit. Eye well developed, sub- 
circular ; its diameter entering four times in the length of the side of the head. Anterior margin of dorsal fin equidistant 
between the extremity of the snout and the fork of the caudal. Origin of ventrals equidistant between the extremity of the 
snout and the insertion of the caudal. Bluish or greyish black above ; yellowish beneath. 
Syn. —Tigovna humboldti, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 206. 
This species resembles T. obesa by a deep and rather short body ; the greatest depth being equal 
to the third of the length, the caudal fin excluded. The head and eyes are also much larger. 
The anal fin is somewhat more developed than the dorsal, which is sub-trapezoid, with its upper 
edge nearly straight, whilst the inferior edge of the anal is sub-concave, and its anterior margin 
nearer the fork of the caudal than the isthmus, whilst its base enters about eight times in the 
total length. The ventrals are posteriorly rounded off, extending as far as the vent. The 
pectorals are likewise broad and rounded posteriorly, but they do not reach the insertion of the 
ventrals 
D 1, 9 ; A 1, 12 ; C 5, 1, 9, 8, 1, 4 ; V 1, 9 ; P 14. 
The scales are much larger than in T. obesa, and somewhat smaller on the dorsal region in 
advance of the fin than alorg the flanks. The lateral line is but slightly deflexed opposite the 
pectorals, whence it is straight to the tail, somewhat below the mesial line of the flanks. 
The dorsal region above the lateral line is bluish or greyish black, with a yellow or reddish 
streak from the supra-tympanic region to the peduncle of the tail. The flanks below the lateral 
line, and the belly, are yellowish. The fins are more or less greyish, upon a yellowish ground. 
List of specimens. 
Catal. 
No. 
Cor. No. 
of teeth. 
No. of 
spec. 
Age. 
Locality. 
When 
collected. 
Whence obtained. 
Nature of 
specimen. 
Collected by— 
225 
2779 
2 
Ad’t.&Y’g. 
1852 
J. Soule Bowman ... 
Alcoholic .. 
J. Soule Bowman. 
5. TIGOMA EGREGIA, Grd. 
Spec. Char. —Body rather elongated, sub-fusiform in profile. Head contained four times in the length, the caudal fin 
excluded. Snout sub-conical and thickish ; gape of the mouth slightly oblique ; jaws equal ; posterior extremity of the 
maxillary extending to a vertical line drawn within the anterior rim of the orbit. Eve moderate sized, sun-circular; its diameter 
entering four times and a half in the length of the side of the head. Anterior margin of dorsal fin nearer the extremity of the 
snout than the fork of the caudal. Origin of ventrals equidistant between the insertion of the caudal fin and the extremity 
of the snout. Bluish black above ; yellowish orange beneath. 
