232 Bulletin 47, United States National Museum. 



365. LEUCISCUS BICOLOB* (Girard). 



Head 3f; depth 3f ; eye small, 6. D. 8; A. 8; scales 13-60-7; teeth2, 5-5, 2. 

 Body robust, heavy anteriorly, tapering backward. Head long, mouth 

 large, the maxillary reaching eye. Lateral line decurved. Dorsal fin 

 inserted almost directly over ventrals ; fins rather small. Dusky above, 

 sides and below silvery, the color contrasting with that of the back. 

 Length 12 inches. Klamath Lake, Oregon, (tricolor, two-colored.) 



Tigoma bicolor, GIRARD, Proc. Ac. Nat. Sci. Phila., 1856, 206, Klamath Lake, Oregon; and 

 Pac. R. R. Surv., x,289, 1858. (Type, No. 234. Coll. J. S. Newberry.) 



Ghemda cferulea, f GIRARD, Z. c., 1856, 207, Lost River, Oregon. (Type, No. 237 (2790). Coll. 

 J. S. Newberry.) 



Bqualius cieruleus, COPE, Proc. Ac. Nat. Sci. Phila., 1883, 146 ; JORDAN & GILBER, Synopsis, 241, 

 1883. 



Squalw* bicolor, JORDAN & GILBERT, Synopsis, 237, 1883. 



366. LEUCISCUS LINEATUS (Girard). 

 (GREAT CHUB. CHUB OF UTAH LAKE.) 



Head 3; depth 3|; eye 7. D. 9; A. 8; scales 10-55 to 63-5;t teeth 2, 5-4, 2, 

 short and stout, one of them with grinding surface. Body robust, elevated 

 anteriorly, the sides compressed, although the back is very broad. Head 

 broad, the interorbital space flattish. Adult with the profile concave, the 

 young with profile straight or convex. Snout broad, elevated at tip; pre- 

 maxillary on level of pupil. Mouth very oblique, the mandible project- 

 ing; maxillary reaching front of eye. Eye small, anterior, If in snout. 

 Isthmus very narrow. Scales large, subequal, broadly exposed, firm. 

 Lateral line decurved. Dorsal nearly median, inserted directly over ven- 

 trals; caudal evenly forked, the peduncle long and deep. Pectorals short, 

 extending three-fifths the distance to ventrals; ventrals about to vent. 

 Lower fins short. Color blackish ; everywhere dark ; the scales much dotted 

 and with darker edges, which often form lines along the rows of scales; 

 males without red. Length 12 to 15 inches. One of the largest and most 

 widely distributed species, found everywhere in the Great Basin of Utah, 

 and also abundant in the Snake River Basin above the Shoshone 

 Falls as far as the Yellowstone Park. Extremely destructive to other 



*Mr. Barton A. Bean, who has kindly reexamined the types of Tigorna bicolor, writes to us: 

 "The types of Tigorna bicolor and Siboma atraria differ greatly in form, color, and somewhat in 

 size of scales. Atraria is more robust than bicolor, its scales are larger, and its color quite dis- 

 tinct. The silvery color on the sides of T. bicolor, extends from considerably above the lateral 

 line to all the lower parts. The scales of bicolor count 13-60-7, while in S. atraria. of the same 

 size they are but 11-52-53. In younger examples there arise a larger number of scales, the type 

 of itraria having 11-55." 



^Leucitcus cserulem, (GIRARD). Head 3%; depth 4%. D. 9; A. 7; scales 13-61-7 in type; 

 teeth 2, 5-5 2, with narrow grinding surface. Body slender, subfusiform. Head slender, the 

 snout long, conical, rather flattened above. Jaws equal, the maxillary reaching to orbit. 

 Dorsal fin inserted behind veutrals; anal fin quite small. Lateral line decurved. Dusky bluish 

 above, pale below; scales everywhere with fine punctulations. Lost River, Oregon; certainly 

 identical with L. bicolor. The original type has the head longer, the snout much longer and 

 pointed, the mouth larger, the maxillary longer and less oblique, the eye somewhat larger, and 

 the top of the head more flat than in Leuciscus linealus. 



J Scales 12-63-7 is the most usual number in the Snake River Basin. The number seems to 

 vary from 53 to 63. 



