304 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY — IV. 
1 18.— §TE\OC>US Richardson. 
Inconnur,. 
(Luciointita Giiiither.) 
(Richardson: type Salmo mackenzii Rich.) 
lioily nither eloii‘’-ate, little conipre.ssed. Tlead long, tlie cleft of tlie 
nioiith wide. ^Maxillary long, broad, lanceolate, extending far backward, 
lower jaw in'ojecting nmcli beyond the iii)i)er. Dentition very feeble, 
the teeth extremely small j hiaxillary toothless; vomer, palatines, and 
tongne with narrow bands of minute villiform teeth. Gill-rakers rigid, 
awl-shaped, rough interiorly. Branchiostegals 10. I’ylorie eoeca in i 
great number. Dorsal hn moderate, over ventrals; anal rather long; | 
caudal forked. Scales moderate. Coloration silvery. jMigratory trout \ 
of large size, inhabiting the streams of Arctic America and Asia. , 
(/rrAr/?, narrow; oiJohz, tooth.) 
-198. S. milCtiCsaxai Richardson. — Tnconnu. 
Doily elongate, subterete. Head long and compressed, with flattened ! 
vertex. Eye moderate. I’reopercle much curved. Dorsal fin nearer i 
caudal than snout. Bluish above; sides silvery, as in the Corerjoni. \ 
Head 3.]. B. 10; D. 13; A. 15; scales 11-lOG-lO. Mackenzie’s Diver ! 
and its tributaries. 
(Salmo macJccnzii Richardson, Franklin’s Jonrn. 1823, 707 : Lncioindta maclcenziei 
Gunther, vi, lG-1.) 
119.— OACOKEIlbVCSIES Suckley. 
Facijic Salmons. ^ 
(Suckley, Ann. Lyc. Nat. Hist. N. Y. 1831, 312: type Salmo scouleri Rich.) 
Body elongate, subfusiform or compressed. Mouth wide, the maxil- , 
lary long, lanceolate, usually extending beyond the eye; jaws with j 
moderate teeth, which become in the adult male enormously enlarged | 
in front. Vomer long and narrow, flat, with a series of teeth both on the ; 
head and the shaft, the latter series comparatively short and weak; 
l)alatines with a series of teeth; tongue with a marginal scries on each 
side; teeth on vomer and tongue often lost with age; no teeth on the 
hyoid bone. Branchiostegals more or less increased in number. Scales ij 
moderate or small. Dorsal fin moderate; anal fin comparative!}’ elon- 
gate, of 14-20 rays. Pyloric appendages in increased number. Gill- 
rakers ralher numerous. Ova large. Sexual iieculiarities very strongly 
dcveloiied; the snout in the adult males in summer and fiill greatly 
distorteil ; the premaxillaries prolonged, hooking over the lower jaw, ; 
which in turn is greatly elongate and somewhat hooked at tip; the 
