Salmonidas 67 



prognathus}. Argyrosomus lucidus is abundant in Great Bear 

 Lake. In Alaska and Siberia are still other species of the cisco 

 type (Argyrosomus laurettoz, A . pusillus, A . alascanus} ; and in 

 Europe very similar species are the Scotch vendace (Argyrosomus 

 vandesius} and the Scandinavian Lok-Sild (lake herring), as 

 well as others less perfectly known. 



The Tullibee, or "mongrel whitefish" (Argyrosomus tullibee}, 

 has a deep body, like the shad, with the large mouth of the 

 ciscoes. It is found in the Great Lake region and northward, 

 and very little is known of its habits. A similar species (Argy- 

 rosomus cyprinoides} is recorded from Siberia a region which 

 is peculiarly suited for the growth of the Coregoni, but in which 

 the species have never received much study. 



Brachymystax and Stenodus, the Inconnus. Another little- 

 known form, intermediate between the whitefish and the salmon, 



FIG. 52. Inconnu, Stenodus mackenziei (Richardson). Nulato, Alaska. 



is Brachymystax knock, a large fish of the mountain streams of 

 Siberia. Only the skins brought home by Pallas a century ago 

 are yet known. According to Pallas, it sometimes reaches a 

 weight of eighty pounds. 



Still another genus, intermediate between the whitefish and 

 the salmon, is Stenodus, distinguished by its elongate body, 

 feeble teeth, and projecting lower jaw. The Inconnu, or Mac- 

 kenzie River salmon, known on the Yukon as "charr " (Stenodus 

 mackenziei}, belongs to this genus. It reaches a weight of twenty 

 pounds or more, and in the far north is a food-fish of good 

 quality. It runs in the Yukon as far as White Horse Rapids. 

 Not much is recorded of its habits, and few specimens exist in 



