136 University of Washington Publications in Biology [Vol. 2. 



lb. Anal fin short, of 9 to 12 rays, rarely 13 ; gill rakers 20 or fewer on 1st 

 arch; branchiostegals 10 to 12; dorsal fin black-spotted. 



6a. Species with darkish spots on a lighter background ; fewer than 

 190 scale rows crossing the lateral line ; vomer flat, its toothed 

 surface plane, teeth on shaft of the vomer in alternating rows or 

 in one zigzag row, those on the shaft placed directly on the sur- 

 face of the bone, not on a free crest. 



7a. Red dash on dentary (between lower jaw bone and isthmus) 

 evident in life; no red spots on side of body; vertebrae 58 to 

 62 (usually 60 or 61) ; dorsal rays 9 to 11 (usually 10) ; anal 

 rays 9 to 11 ; maxillary on adults extending behind eye, about 

 1.6 to 2.25 in head; hyoid teeth (those located behind the patch 

 of teeth on tip of the tongue) usually present but few and 

 scattered. 



8a. Black spots large and scattered over the body, those on an- 

 terior part of the body widely separated, the spots are usually 

 absent from belly and almost to the lateral line ; scales above 

 and below lateral line 32 to 42 (usually 35 to 38) ; scales 

 in the lateral line 156 to 190 (usually about 165 to 170) ; 

 gill rakers 6 to 9+10 to 13, totaling 15 to 22. Range: Mid- 

 dle and upper Columbia River drainage. Introduced else- 

 where. Freshwater. Abundant. Fig. 27. 



Montana Black-spotted Trout 37. Salnw clarkii lewisi 



(Girard) 



■Cutthroat- nark 



Fig. 27. Montana Black-spotted Trout. 

 Cutthroat Trout. Salmo clarkii lewisi. Af- 

 ter Schultz and Hanson. Courtesy of the 



Washington Sportsman. 



8b. The body is profusely covered with black spots, a few even 

 occurring on the belly, the spots about as close together pos- 

 teriorly as anteriorly ; scales above the lateral line 35 or 

 fewer ; scales below lateral line 35 or fewer ; scales in the 

 lateral line 120 to 180 (usually fewer than 160). In the 

 Puget Sound drainage 2 types of cutthroat trout have been 

 observed. They are distinguishable as follows : Scales 120 

 to 140 (usually about 125 to 130) instead of 143 to 180 in 

 the lateral line ; scales 25 to 29 instead of 30 to 36 (usually 

 31 to 35) above the lateral line; scales below the lateral line 

 about 27 to 28 instead of 30 to 34. Recent evidence indicates 

 that this great variation in the number of scales may be 

 caused by the different temperatures during which early de- 

 velopment takes place in the various localities. Range : 

 British Columbia to California. Marine and freshwater. 

 Fig. 28 



Coastal Cutthroat Trout 38. Salmo clarkii clarkii 



Richardson 2 



'Under this name we are including Salmo clarkii crescentis, the speckled trout of 

 Lake Crescent, Olympic Mountains. 



