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



21b. Scales more than 45 on the back before the dor- 

 sal fin; 16 to 24 scales above the lateral line. 



22a. Scales 46 to 56 before the dorsal; 16 to 20 

 above the lateral line and 67 to 75 scales in the 

 lateral line. Range : Puget Sound drainage, 

 Columbia River drainage and coastal streams 

 of Oregon and Washington. Freshwater. Abun- 

 dant. 



Squawfish. Oregon Pike 



..99. Ptychocheilus orcgonensis (Richardson) 



22b. Scales 55 to 68 before the dorsal; 19 to 24 

 (21) above the lateral line; 73 to 85 (75) in 

 lateral line. Range : Coastal streams of Ore- 

 gon — Siuslaw and Umpqua rivers only. Fresh- 

 water. Common. 

 Squawfish. 100. Ptychocheilus umpquae Snyder 



19b. Anal rays 10 to 22; mouth oblique; depth 3% to 4^4 

 in standard length; eye 3 to 4 in head; scales 13+55 

 to 63+6; head 4 to 4 l / 2 in length; body much com- 

 pressed with a wide lateral band of blackish color 

 between two silvery streaks. 



23a. Anal rays 10 to 13, usually 11 or 12. Range: 

 Palouse River of eastern Washington; Bo- 

 vill, Idaho ; above falls of the Snake River ; 

 and Salt Lake drainage of Utah. Fresh- 

 water. Abundant. 



Red-sided Shiner or Bream... 101. Richard- 

 sonius balteatus hydrophlox (Cope) 



23b. Anal rays 13 to 22, usually 14 to 18. Range : 

 Columbia River system; streams of Wash- 

 ington, of Oregon, and Fraser River. 

 Freshwater. Abundant. 



Red-sided Shiner or Bream... 102. Richard- 

 sonius balteatus balteatus (Richardson) 



Family 31. Ameiuridae. Catfishes 



la. Caudal fin deeply and sharply forked. Range: Mississippi and Great Lakes 

 drainage. Probably introduced into the Columbia River system. 

 Channel Cat 103. Ictalurus punctatus (Rafinesque) 



lb. Caudal fin emarginate to rounded. 



2a. Anal rays 17 to 21 (including rudiments) usually 18 to 20; pectoral 

 spines at all ages entire or only slightly roughened behind ; outer 2 /z of 

 inter-radial membranes of anal fin uniformly pigmented, always darker 

 than the rays, the fin never mottled or barred or uniformly pigmented 

 on both membranes and rays as in ncbulosus. Range : Introduced into 

 western United States. Freshwater. 

 Black Catfish. Horned Pout 104. Ameiurus mclas (Rafinesque) 



2b. Anal rays 19 to 24, usually 20 to 23; pectoral spines in the young with 

 long sharp barbs on posterior edge, their length more than half the diam- 

 eter of the spine, (barbs increasing in number and desceasing in relative 

 size with age) ; black pigment on anal fin typically densest on the mem- 



