PLEGTOSPONDYLI CYPRINIDAE SIBOMA ATEARIA. 667 



depth of caudal peduncle 3 J times into depth at ventral. Profile and inter- 

 orbital region slightly convex ; width of latter 3 times in length of head. 

 Diameter of eye 4 times in greatest length of head and 1.1 times in length 

 of muzzle. End of maxillary not reaching posterior rim of orbit. Total 

 length, 0.140 meter. Color purplish-brown on dorsal region ; lower fins 

 fins yellowish-pink. 



GILA EMOKII, Bd. & Gir. 



Gilo, emorii, BD. & GIR., Proc. Acad. Nat. Sci. Phila., vi, 1853, 388. GIB., Proc. Acad. 

 Nat. Sci. Phila., viii, 1856, 205. Id. U. S. & Mex. Bound. Surv., ii, Ichthy- 

 ology, 1859, 62. 



This beautiful species, resembling G. graJiamii, although said to be 

 numerous in the Gila River, was not brought in by survey, but it is be- 

 lieved numbers were taken with the other species of Gila in that stream. 



SIBOMA, Gir. 



Proc. Acad. Nat. Sci. Phila., 1856, 208. 

 SIBOMA ATRAEIA, Gir. 



Siboma atraria, GiR., Proc. Acad. Nat. Sci. Phila,, viii, 1856, 203. Id., P. E. E. Eep., 

 x, 297, 277. COPE, U. S. Geol. Surv. Montana & Adjacent Territories, 

 1871, 475. Id., Proc. Am. Phil. Soc. Phila., 1874, 132. Id!., Rep. Plagop. & 

 Ichthy. Utah, 1874, 10. 



The specimens in our collection correspond well with Girard's descrip- 

 tion, except that in some instances we find the dorsal fin to have 10 rays ; 

 the ventrals 9. 



Very abundant in streams throughout entire Rocky Mountain basin. 

 This species is very common in Utah Lake, and is called by the Mormon 

 settlers in Utah the Mullet; but resembles in no wise the well known marine 

 form. Although not specially fished for, great numbers are taken every 

 year in the trout nets. 



In summer, the flesh is soft and insipid; but in the cold months of the 

 year, it is firm and well-flavored, and they are sold to a considerable extent in 

 the Salt Lake City market, the price being, as an average, about three cents 

 per pound. They spawn in April, and run up the rivers, returning in June. 



