304 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



119. STE\ T OUS Richardson. 



^nconnus. 



(Liiciolrutta Giiiither.) 

 (Richardson: type Salmo mficl:i'n:ii Ricli.) 



I3o;ly ratlu-r elongate, little compressed. Head long, the cleft of the 

 mouth \viile. Maxillary long', broad, lanceolate, extending far backward, 

 lower jaw projecting much beyond the upper. Dentition very feeble, 

 the teeth extremely small; maxillary toothless; voiner, palatines, and 

 tongue with narrow bauds of minute villiform teeth. Gill-rakers rigid, 

 awl-shaped, rough interiorly. Brunehiostegals 10. Pyloric cceca in 

 great number. Dorsal fin moderate, over ventral* ; anal rather long; 

 caudal Corked. Scales moderate. Coloration silvery. Migratory trout 

 of large size, inhabiting the streams of Arctic America and Asia. 

 (77^0?, narrow; onnb-, tooth.) 



498. S. nriaelicazai Richardson. Inconnu. 



Body elongate, subterete. Head long and compressed, with flattened 

 vertex. Eye moderate. Preopercle much curved. Dorsal tin nearer 

 caudal than snout. Bluish above; sides silvery, as in the Corcyoni. 

 Head :\\. B. 10; D. 1,,; A. 15; 'scales 11-100-10. Mackenzie's Hiver 

 and its tributaries. 



(S(ilni') in-n:ki-n:ii Richardson, Franklin's Journ. 1823, 707: Luciolrutta mackenziei 

 Giiuthcr, vi, 1(34.) 



1 19. OXCOESEI VWCEIUS Surkl.-y 



Pacific Xalmons. 



\!rv. Ann. Lyr. Nat. Hi-4. X. Y. 1861, :>H: type Sal mo scouleri Rich.) 

 Body elongate, subi'iisit'onn or compressed. Mouth wide, the maxil- 

 lary long, lanceolate, usually extending beyond the eye; jaws with 

 moderate teeth, which become in the adult male enormously enlarged 

 in front. Yomer long and narrow, Hat, with a series of teeth both on the 

 head and the shaft, Hie latter series eomparat ively short and weak; 

 palatines with a series of teeth; tongue with a marginal series on each 

 s:de: teeth oa Yomer and tongue often lost with age: no teeth on the 

 liyoid bone, Ilranehioslegals more or less increased in number. Scales 

 modei-a!e or small. Dorsal I'm moderate; anal fin comparatively elon- 

 gate, of I l-iM rays. 1'ylorie appendages in increased number. (Jill- 

 r.ikers rather numerous. Ova large. Sexual peculiarities very strongly 

 developed; the snout in the adult males in summer and fall greatly 

 distorted; the'premaxillaries prolonged, hooking over the lower jaw, 

 which in turn is greatly elongate and somewhat hooked at tip; tine 



