2798 Bulletin //, United States National Museum. 



378(a). LEUCISCUS 3VACHTRIEBI, Cox. 



Head 4 to 4|; depth 5 (41 to 5) ; eye 4; snout 4|. D. 8; A. 8. Body 

 rather heavy, not greatly compressed; back slightly elevated, its curve a 

 little greater than that of the belly; caudal peduncle rather stout, its 

 depth the length of the head. Head rather short, not any more com- 

 pressed than the body, upper surface slightly flattened; snout quite blunt 

 in mature individuals, its length 1 times width of eye ; mouth not very 

 large, but little oblique, lower jaw included; maxillary scarcely reaching 

 to front of orbit; pharyngeal teeth 2, 4-5, 2. Dorsal fin inserted nearer 

 base of caudal than tip of snout, also slightly back of ventrals; caudal 

 fin forked; anal slightly smaller than dorsal ; ventrals small, not reaching 

 vent by \ their length ; pectorals inserted rather high, not reaching the 

 ventrals by f their length; scales small, 12-72-9, lateral line complete on 

 mature individuals, decurved, the pores extending on head in several lines, 

 1 passing back of eye, another down to nostril. General color dusky, 

 darkest on back; sides above lateral line dull silvery, below lateral line 

 light silvery ; a faint dark dorsal band in some specimens, in others absent ; 

 no black lateral band, but some specimens have a very faint dusky shade 

 along lateral line; no light stripe above lateral line; upper portion of 

 opercles with a dusky shade, lower part bright silvery ; upper part of 

 head dark- colored; all the above colors typical in the young as well as 

 adults. Length 4 inches. L. nachtriebi differs from L. neoganus in having 

 a well-developed lateral line, a smaller eye, fewer scales, less oblique 

 mouth, a shorter maxillary, and in being a larger fish and differently 

 colored. It differs from L. elongatus in having a smaller mouth, the lower 

 jaw never projecting, head less pointed, a shorter maxillary, finer scales, 

 and the absence of the black lateral band. Lakes of northern Minnesota ; 

 at present known from Mille Lacs, Man Trap, Mud and Elbow lakes. 

 (Named for Prof. Henry F. Nachtrieb, State zoologist of Minnesota.) 



Leuciscus nachtriebi, Cox, Kept. U. S. Fish Comm. 1894 (Dec. 14, 1896), 615, Mille Lacs 

 Lake, Aikin County, Minnesota. (Type, No. 47688. Coll. Minn. Nat. Hist. Surv.) 



Page 241. To the synonymy of Leuciscus neogasus add : 



Cyprinus burtonianus, LE SUEUK in VAILLANT, Bull. Soc. Philom., vm, 1896, 28, with 

 plate, Burton Mine, Missouri. 



Page 244. Leucos and Myloleucus can not be maintained as subgeuera, 

 the characters of the teeth not being constant. 



The following notes on Kutilus olivaceus as seen at Emerald Bay, Lake 

 Tahoe, may prove useful. 



385. RUTILUS OLITACEUS (Cope). 

 (TAHOE CHUB.) 



This species is very different from Rutilus symmetric, looking like 

 Leuciscus lineatus. Very common ; reaches 2 to 3 pounds weight ; devours 

 eggs of tront. No doubt the records of Leuciscus lineatus (atrarius} from 

 Lake Tahoe belong to this species. Head4; depth 4H<>4. D.8; A. 8; scales 

 11-56-6; teeth always 5-5, with broad grinding surface. Body oblong, 



