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



13a. Barbel just anterior to tip of maxillary ; 55 to 

 58 scales in the lateral line; 10 to 11 scales above 

 and 6 to 8 below the lateral line ; teeth 2 :4-4 :2. 

 Range : Stuart Lake, headwaters of Fraser Riv- 

 er, B. C, and Lake Pend d'Oreille, Idaho. 

 Freshwater. Abundant. 



Chub Minnow. Lake Chub 



89. Couesius greeni Jordan 



13b. Barbel terminal on maxillary ; 43 to 90 scales in 

 the lateral line (usually 52 to 75) ; 13 to 15 

 scales above and 9 to 11 below the lateral line; 

 teeth 2:4-4:2 to 0:4-4:1. 



14a. Dorsal fin with the distal edge concave, some- 

 times strongly falcate ; innerside of rays of 

 ventral fins with more or less conspicuous 

 membraneous stays joining them to the body; 

 sides of body with blackish-brown blotches, 

 sharply contrasting with lighter color of body. 



15a. Scales 63 to 70 in lateral line ; least depth of 

 caudal peduncle more than half postrostral 

 length of head. Range : Columbia River ba- 

 sin east of Cascade Range and in Payette 

 and Salmon rivers, Idaho. Freshwater. Com- 

 mon. 



Dace 90. Apocope umatilla 



(Gilbert and Evermann) 



15b. Scales 50 to 57; least depth of caudal pe- 

 duncle less than half postrostral length of 

 head. Range : Columbia River Basin east of 

 Cascade Range. Freshwater. Locally abun- 

 dant. 



Dace 91. Apocope falcata (Eigenmann 



and Eigenmann) 



14b. Dorsal fin with the distal edge not concave and 

 never falcate, instead rounded; sides of body 

 without large dark blotches, instead the sides 

 are speckled with numerous small brownish- 

 black spots which cover about 2 or 3 scales. 



16a. Scales 47 to 70 in the lateral line. 



17a. Intense dark lateral band; streams of 

 coastal area. Range : Lower Columbia 

 River and coastwise streams of Washing- 

 ton and Oregon. Freshwater. Common. 

 Black-nosed Dace. Black-sided Dace.... 

 92. Apocope oscula nubila (Girard) 



17b. Lateral band faint ; body speckled ; streams 

 east of the coast range, usually in non-for- 

 est areas. Range : Middle and upper Co- 

 lumbia River basin, the Great Basin, and 

 Coast Range of southeastern Oregon. 

 Freshwater. Abundant. 



Speckled Dace 



93. Apocope oscula carringtoni Cope 



