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60 ZOOLOGY— FISHES. 



June, and at this period they are extremely wary, and are caught with 

 difficulty. They run up the river, returning- late in July. After an entire 

 morning's labor, we succeeded in taking only about two dozen, notwith- 

 standing we used three different kinds of nets. It is said that the male fish 

 constructs the nest displacing pebbles and gravel by convulsive move- 

 ments of the body, and that after the eggs arc deposited watches over them. 

 We know by personal experience that this watch is carefully kept up, as 

 we have driven fish away from certain localities with our net, and in a few 

 minutes found the same individuals to return. 



In the stomach of the trout of Provo River, we have found eight or 

 ten of these fishes. 



Also found in Beaver River, Middle Utah. 



GILA ARDESIACA, Cope, sp. nov. 

 Plate XXX, Figs. 1, la. 



The Gila ardesiaca is a fish of the compressed form, characteristic of 

 (i. hydrophlox, and the mouth is short and directed obliquely upward. The 

 muzzle is short, but not descending, and is not longer than the diameter of 



IV 



the large eye. Scales, «; anal radii, I. 8. Base of first dorsal ray measuring 



8 



the middle point between the basis of the caudal lin and the posterior bor- 

 der of the orbit. Pectoral fin with enlarged radii, nearly reaching the 

 ventral : the latter not quite reaching anal orbit one-fourth of length of 

 head, equal to the interorbital width. Head 3.5 times in length to basis of 

 caudal fin; greatest depth 4.2 in the same. Dental formula 4.2-2.5. 



< Hive above, with a lead-colored band from the upper canthus of the 

 branchial fissure to the base of the caudal fin; head dusky; the operculum 

 steel-blue. Length, 0™.095. Locality of the single specimen unknown. 



This fish is of the same group as the G. montana, but from this and the 

 G. hydrophlox it differs in the shorter anal fin with but few rays. 



GILA PANDORA, Cope. 

 Clinostonius pandora, Cope, Ann. Pep. U. S. Geol. Surv. Terrs., 1871, 475. 



This is the common chub or pescadito of the Rio Grande and its tribu- 



