EXPLORATIONS IN COLORADO AND UTAH. 
31 
through the overflow of the pond and the chub has proved very niischievous, devour- 
ing the eggs and fry of the carp and checking all increase. 
3. Jordan River . — Jordan Eiver is the outlet of Utah Lake. It is a clear or slightly 
milky stream, rather warm in summer with moderate current and a bottom of sand and 
adobe. Chubs, suckers, and sometimes wliitefish are everywhere plenty. Trout weie 
common before they were excluded by the dams of the irrigating ditches. These now 
consume all the water of Jordan Eiver in summer, the river bed being tilled up by 
seepage and by the overflow from the numerous artesian wells. Jordan Eiver was 
seined at a point just below a dam 4 miles southwest of Salt Lake City. The stream 
is here about 2 rods wide and 2 to 5 feet deep, the bottom being of adobe; tempera- 
ture about 03°. Species found in Jordan Eiver are marked J. 
4. Great Salt irt/ce.— The waters of the lake are intensely salt and no Ashes ever 
enter them. The only living thing in the water is a small brine shrimp. 
PISHES OF THE SALT LAKE BASIN. 
1. Catostomus ardens Jordan & Gilbert. U., J. “Red Horse Sucker;” “Mullet.” 
This species is the cbmmon sucker of Utah Lake, existing in millions and far out- 
numbering all the other species combined. The young are very abundant in Jordan 
Eiver. This species reaches a weight of about 2 pounds. It is very close to Catosto- 
mus teres., almost the only tangible differences being in the rather smaller scales, the 
usually longer mandible, 3 to 3^- in head in the adult in C. ardens, 3^ to 3§ in O. teres, 
and in the broader upper lip. 
Upper lip rather small, with four or five rows of coarse papillie. Snout forming 
a moderate “nose;” mandible' little oblique or nearly horizontal; scales 63 to 71. 
Dorsal rays 12 or 13, the tin longer, lower, and less straight on the free edge than in C. 
fecundus. Base of dorsal in adult, IJ to If in head; longest I’ay, 1 to 1 in base of tin; 
head, 4 in length; eye, small; snout, 2^ in head, pectoral and caudal rather short. 
Color of specimens in the lake darker than that of C. fecundus, the lower tins dusky. 
Spawns in March. 
2. Catostomus fecundus Cope and Yarrow. Webug. 
The “ Webug” sucker is found only in the lake. It is much less abundant than 
the preceding, and reaches a smaller size, rarely weighing more than a pound. 
It has a small mouth at the end of a long, projecting snout, which forms a distinct 
nose; mandible very oblique, almost as in Ghasmistes, its length 2f to 2 a iu head. 
Snout 2f. 
Lips wide but smoothish, the upper with about four rows of large papillae. Scales 
64 ; D. 11 or 12. Dorsal tin shorter and usually higher than iu C. ardens, its base in 
the adult IJ in head, its longest ray usually a little shorter than the base of the tin. 
Lower fins long. Color rather pale. 
3. Ghasmistes liorus (Jordan). The “Sucker.” U. (Plate V, Fig. 13.') 
Abundant in Utah Lake, reaching a weight of 3 pounds. It spawns in June. 
Mouth very large, oblique, with full lips, which are non-papillose. A distinct 
nose; mandible 2§ in head. D. 13. Scales, 66. Fins large. Dorsal low, its free 
margin a little concave. Longest ray f base of fin, which is 1^ iu head. 
4 . Pantosteus generosus (Girard). Mountain Sucker. P., J. 
Very common iu the upper Provo and iu the Jordan. Not exceeding 8 inches in 
