MILNER ON THE GRAYLING. 741 



brane and rajs ; the first Hue begins in tbe middle of the anterior ray 

 and extends diagonally across the membrane and the second ray ; the 

 second liue has its origin at the proximal end of the first ray, and, ex- 

 tends across membranes and rays, to the outer end of the fourth ray ; 

 the third liue begins near the body on the fifth ray, aud extends along 

 the intervening membrane bet^Yeeu the fifth and sixth rays; the fourth 

 line, begiuniug some distance from the body, upon the membrane b<^tween 

 the seventh aud eighth rays, extends in a broken line anteriorly, aud 

 terminates upon the membrane between the sixth and seventh rays, and 

 upon the seventh ray. The lines sometime have flecks of yellow upon 

 them. The rest of the fin is dusky, the first rays and membranes being 

 darker than the others. 



The dorsal along its insertion has a black bne ; next, one of faint rose- 

 hue; then there is a blackish one; again one of rose-hue ; then blackish 

 again ; then there is one of rose-hue, beginning at the sixth ray and ex- 

 tending to the middle of the fin, and continuing out as a row of spots in 

 a dark ground ; then there is a row of spots of dusky-green tint ; then a 

 row of minute spots of rose ; then a broad dusky area. The middle 

 portion of the margin of the fin is tipped with rose. 



The anal aud adipose fins are dusky with a faint bluish cast. 



The central rays of caudal are purplish pink ; the other rays are dusky 

 brown. The outer margin of the caudal is tipped with lines of colors like 

 a faint spectrum. 



A very small naked space is found on the branchial isthmus. 



Length, 11.83 inches. 



ISational Museum, No. 11099. Locality, Ausable Eiver, Michigan. 

 Collector, D. H. Fitzhugh, jr. 



Thymallus montanus, sp. nov. 



Form much less elongate than in T. tricolor. The greatest height of 

 the body is more than the length of the head, and nearly equal to the 

 base of the dorsal. The length of the snout is less than the width of the 

 interorbital area. The diameter of the orbit equals .the width of the 

 operculum. The origiu of the dorsal fin is anterior to a point midway 

 betwee]! the pectorals and the ventral s. 



The height is .23^ of the length without the caudal ; the greatest 

 width of the body is -lOi; the least height of tail is .09 ; the length of 

 the caudal peduncle is .15.^ ; the distance from the snout to the dorsal fin 

 is .33^ ; the length of the base of the dorsal is .25 ; the distance from the 

 snout to the anal fin is .75 ; the distance from the snout to the ventrals 

 is .45^ ; the length of the median rays of the caudal is .07 ; the length 

 of the external rays is .16^. 



The head is .21^ of the length without the caudal ; the distance from 

 the snout to the nape is .15^ ; the width of the head is .45^ of the length 

 of the head; the width of the interorbital area is .202; the length of the 

 maxillary is .32f ; the length of the mandible is .47^-; the length of the 



