FISHES OF MINNESOTA 31 



of the eye, another down to the nostril. General color dusky, dark- 

 est on the back; the sides above the lateral line dull silvery, below 

 the lateral line light silvery; a faint dark dorsal band in some speci- 

 mens, in others absent; no black lateral band but some specimens 

 have a very faint dusk}' shade along the lateral line; no light stripe 

 above the lateral line; upper portion of the opercles with a dusky 

 shade, lower part bright silvery; upper part of the head dark col- 

 ored; a faint rose colored lateral band generally present in fresh 

 specimens ; all the above colors tj'pical in the young as well as the 

 adult. Head contained 4^ (4 to 4^) times in the length of the body. 

 Depth 5 (4J to 5^). Length 4 inches. 



L. nachtriehi differs from L. neogwus in having a well 

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

 mouth, a shorter maxillaiy and in being a larger fish and differ- 

 ently colored. It differs from L. elongatus, a species which might 

 occur in the state, 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. The accompanying tabu- 

 lated measurements will give some idea of the variation of the 

 species. 



At present this fish is known from but two localities, viz., Mille 

 Lacs Lake, Atkin County, where several specimens were taken by 

 the Nat. Hist. Surv. in 1892, and in Man Trap, Mud and Elbow 

 Lakes in the region of Park Rapids, Hubbard County, where sev- 

 eral specimens were taken by the Nat. Hist. Surv. in 1893. In 

 all, about 40 specimens have been taken, several of which were 

 tagged and examined by Mr. F. B. Sumner, then of the University, 

 who was in charge of the survey party that took these flsh and who, 

 himself, thought that they were new, but did not describe them. 

 The species is named for Prof. Henry F. Nachtrieb, State Zoologist 

 of Minnesota. 



