1936] Schults: Keys to Fishes 149 



16b. Scales 68 to 80 in the lateral line. Range: 

 Klamath basin. Freshwater. Common. 



Klamath Dace 94. Apocope klamnthensis 



(Evermann and Meek) 



lib. Premaxillary not protractile, a broad frenum pres- 

 ent binding it to the snout; mouth inferior, the snout 

 projecting over the mouth; teeth 1:4-4:1. 



18a. Dorsal rays 9 or 10; scales 57 to 59 in lateral 

 line ; depth of caudal peduncle 10 times in standard 

 length. Range: Umpqua River, Oregon. Fresh- 

 water. Common. 



Long-nosed Dace of Umpqua River System 



95. Rhinichtkys evermanni Snyder 



18b. Dorsal rays 8, seldom 9; scales 62 to 75 in lateral 

 line ; depth of caudal peduncle about 8.3 in standard 

 length. Range: Streams of northwestern United 

 States. Freshwater. Abundant. 



Long-nosed Dace 



96. Rhinichtkys cataractae dulcis (Girard) 



10b. No barbel on maxillary; premaxillary always protrac- 

 tile. 



19a. Anal rays 7 to 10; mouth terminal, horizontal. 



20a. Eye 1 times in the length of snout; scales 13 to 

 15+60 to 67+7; body less slender, the dorsal con- 

 tour more arched; depth 3^4 in length; eye 5 to 

 Sy 2 in head; dorsal 8; anal 7 to 9; about 9 short 

 blunt gill rakers; peritoneum black; mouth 3% to 

 2>y 2 in head; maxillary barely reaches to vertical 

 below front of eye; interorbital much convex. 

 Range : Klamath Lake and tributaries. Freshwater. 

 Not rare. 

 Chub 97. Tigoma bicolor Girard 



20b. Eye \ l / 2 in snout; eye 7 l / 2 in head; interorbital 

 flattened; scales 13 to 24+67 to 86+7 to 9; head 

 and body long and tapering; dorsal outline not 

 abruptly curved or arched; depth 4.6 to 5.2 in 

 standard length; dorsal 10; anal 8; 5 to 8 short 

 blunt gill rakers on first gill arch; teeth scarcely 

 hooked, but strong and set wide apart; always 2 

 teeth in the lesser row as 2:5-4:2; peritoneum sil- 

 very and usually speckled with black ; mouth deep- 

 ly cleft, the maxillary reaching to under the eye; 

 young with a jet black spot at base of caudal fin 

 rays. 



21a. Scales fewer than 45 (usually 36 to 41) on back 

 before the dorsal fin; scales 13 to 15 above the 

 lateral line. Range: Sacramento River system. 

 Freshwater. Common. 



Sacramento Pike. Squawfish 



98. Ptychocheilus grandis (Ayres) 



