Jordan and Evermann,- Fishes of North America. 2819 



Millimeters. 



Height of body at beginning of caudal 77 



Ventrals under anterior third of dorsal; adipose fin over posterior end of anal; ven- 



trals reach about distance to vent; 24 scales in transverse series from origin of 



dorsal to lateral line ; 125 scales in lateral line. Color silvery gray on back, black 



spots obsolete. 



This species is evidently a close ally of the Atlantic salmon, belonging 

 to the restricted subgenus Salmo. From Salmo salar it differs in the 

 slightly larger mouth and rather different coloration and in very little else. 



Mykiss, PENNANT, Arctic Zool., Intro. ,126, 1792, Kamchatka; after KRASHENINNIKOF, etc. 

 Salmo tnykiss, WALBAUM, Artedi Piscium, 59, 1792, Kamchatka ; based on Mykiss of 



PENNANT. 



Salmo penshinensis, PALLAS, Zool. Rosso- A si at., in, 1811, Gulf of Penshin. 

 Salmo pur pur atu $, PALLAS, Zool. Rosso-Asiat., in, 374, 1811, Bering Sea. 



The correct names of the American Cutthroat Trout and its numerous 

 known varieties are the following: 



780. SALMO CLARKII (Richardson). 

 780(a). SALMO CLARKII LEWISI (Girard). 

 780(b). SALMO CLARKII GIBBSII (Suckley). 

 780 (c). SALMO CLARKII HE1VSHAWI (Gill & Jordan). 

 780(d). SALMO CLARKII YIROINALIS (Girard). 

 780 (e). SALMO CLARKII SPILURUS (Cope). 

 780 (f). SALMO CLARKII PLEURITICUS (Cope). 

 780(g). SALMO CLARKII BOUVIERI (Bendire). 

 780(li). SALMO CLARKII STOMIAS (Cope). 

 780(i). SALMO CLARKII MACDONALDI, Jordan & Evermann. 



Page 500. Before Salmo irideus insert the following : 



781(b). SALMO GAIRDNEKl BEARDSLEEI, Jordan &, Seale. 

 (BLUEBACK TROUT OF LAKE CRESCENT.) 



Head 3| in length to base of caudal; depth about 4; eye 4{j in head, If 

 in snout; scales 24-130-20, 130 cross series, those in front of dorsal numer- 

 ous, about 70 if counted along median line, 60 if the rows along upper 

 side arc counted; dorsal with 10 branched rays; anal with 11 branched 

 rays ; branchiostegals 11 ; gill rakers 8 -f- 13, rather long and slender, the 

 longest nearly j% in length, 7 to 9 in maxillary. Head pointed; mouth 

 rather large; maxillary extending to hinder margin of eye, 1 in head, 

 with about 20 teeth; snout 3| in head; preorbital very narrow, the maxil- 

 lary almost touching the orbit; posterior suborbitals shorter than eye, 

 about 6 in head; opercle not very broad, equal to eye, its free part 4f in 

 head; interorbital width 3 in head, equal to snout; several large teeth 

 along margin of tongue; no hyoid teeth; teeth on vomer in zigzag series. 

 Origin of dorsal in middle of the length, margin slightly concave, the first 

 ray If times the last, the last ray being pointed, slightly greater than 

 base, 2n r in head. Origin of anal midway between origin of dorsal and 

 base of caudal, margin straight, the tip of the last ray slightly exserted ; 

 anterior rays 3 times posterior, and equal to base of fin, 2 in head. Adi- 



