FISHES 69 



Key to the Species of Ptychocheilus 



ai On the Pacific slope. 



bi Dorsal rays q P. iwipqucB. 



b2 Dorsal rays 10 P. oregonensis. 



bs Dorsal rays 8 P. grandis. 



a.-> In the Colorado basin P. Indus. 



P. oregonensis {^ichdirdson}. Squawfish. Length up to 1,200 mm.; 

 head 3.75; depth 5; color greenish; belly silvery; rays of dorsal fin 10; 

 anal 8; scales 20-70: extreme northwest, ascending the Columbia and 

 tributaries into Montana; common; a food and game fish. 



P. umpqua Snyder. Similar to P. oregonensis; scales 75 to 80: 

 coastal streams of central Oregon. 



P. grandis (Ayres). Similar to P. oregonensis; rays of dorsal fin 

 8; anal 8; scales 70 to 80: central and northern California; Oregon; 

 common. 



P. lucius Girard. White salmon. Length up to 1,500 mm.; weight 

 up to 80 lbs.; head 3.5; depth 5.5; color uniform; rays of dorsal fin 9; 

 anal 9; scales 83 to 90: Colorado basin; very common; the largest species 

 in the family. 



15. Gila Baird & Girard. Body elongate; caudal peduncle long and 

 slender; tail widely forked; teeth 2, 5-4, 2, hooked; scales very small; 

 dorsal fin behind the middle of the body; size large : 3 species. 



G. elegans^. hG. Bony-tail. Length 300 mm.; head and depth 5; 

 color bluish above; rays of dorsal fin 9; anal 10; scales 23-85-10; back 

 arched; head short and broad: Colorado and Gila Rivers; abundant. 



G. robusta B. & G. Roundtail. Length 400 mm.; head 4; depth 5; 

 color plain; rays of dorsal fin 9; anal 9; scales 17-80-10: Colorado and 

 Gila Rivers; very common. 



16. Leuciscus Cuvier. Dace; chub. Body oblong; teeth usually 

 2, 5-4, 2, hooked; dorsal fin posterior; size small; colors often very 

 bright; mouth terminal and usually large; no barbels; caudal peduncle 

 stout; rays of dorsal and anal fins usually 8: one of the largest genera, 

 being represented by species in North America, Asia and Europe; 15 

 species in the United States, mostly in the west. 



Key to the United States Species of Leuciscus 



ai In Pacific coast and Great Basin regions, 

 bi In the Pacific coast States. 



Ci In central California L. crassicauda. 



c% In the Klamath Lakes L. bicolor. 



C3 In Puget Soxind region and Columbia basin L. halteatus. 



