6G2 



ZOOLOGY FISIIES. 



D I. 8 ; A. I. 8. First ray of dorsal half way between base of caudal fin, 

 and posterior border of orbit. Total length, 7 inches (O m .17). Color 

 dusky-olive to below the lateral line ; belly silvery ; axils of fins crimson. 

 Region between the lateral line and pectoral fin dusky to beyond the ven- 

 trals. 



GILA EGEEGIA. Cope. 



? Gila cgrcgia, GIB., ? Tigoma cgregia, Gm., P. E. E. Eep., x, 1859, 291. 

 Hybopsis egrcgius, COPE, Ann. Eep. U. S. Geol. Surv. Terrs. 1870, 438. 

 Alburnellusf, COPE, Proc. Am. Phil. Soc. Phila., April, 1874, 133. 



An abundant species in the Rio Grande, much resembling the G. pan- 

 dora, but differing constantly in the smaller and more numerous scales. In 



17 18 



two specimens, they number 1 and . The head enters the length without 



11 9 



the caudal fin four times. The outer rows of pharyngeal teeth are often 

 4-4, but 5-4 in large specimens. . Abnormal developments of the teeth are 

 common in the young specimens of this fish from the Rio Grande. Thus, 

 by the incurvature of the external row, I found the teeth to count (No. 1) 

 3.3.1-3.2.2-1.4.3-2.2.3-2.4.2, and unsymmetrical. 



This species is represented in the collection, also, by a great number 

 of individuals from the Beaver River, Utah, visited by the expedition. 



18 



These compare favorably with Girard's descriptions. Scales, ". Anal radii, 



9 



1-8-7. Teeth, 2.4-4.2. Very abundant in pools of the river. 



