CHAPTER VI 



THE GRAYLING FAMILY 

 (ThymallidcB) 



Thymallus signifer. Head 5! ; depth 4|; eye 3; D. 24; A. n; 

 scales 8-88 to 90-11; cceca 18; body elongate, compressed, 

 highest under the anterior portion of the dorsal ; head rather 

 short, subconic, compressed, its upper outline continuous with 

 anterior curve of the back ; mouth moderate, the maxillary ex- 

 tending to below the middle of the eye; maxillary 6 (?) in 

 head ; jaws about equal ; tongue, in the young, with teeth, 

 which are usually absent in the adult ; eye quite large, rather 

 longer than snout ; scales moderate ; lateral line nearly straight ; 

 a small bare space behind isthmus ; dorsal fin long and high, 

 about 3^ in length of body ; adipose fin small ; anal fin small ; 

 gill-rakers short and slender, about 12 below the angle. 



Thymallus tricolor. Head 5 ; depth 5^ ; eye 4 ; D. 21 or 22 ; A. 10 ; 

 scales 93 to 98 ; gill-rakers 7 + 12 ; maxillary 2j- in head ; dorsal 

 fin 5 \ in length of body. Otherwise much as T. signifer. 



Thymallus montanus. Head 5; depth 4^; eye 3|; D. 18 to 21; 

 A. 10 or ii ; scales 8-82 to 85-10; gill-rakers 5 + 12; maxil- 

 lary 3 in head ; dorsal fin 4^ in length of body. Other features 

 much resembling T. signifer and T. tricolor. 



OWING to the restricted area of its distribu- 

 tion, the "graceful, gliding grayling" is known 

 to but comparatively few anglers in America. 

 He who has been so fortunate as to have this 



173 



