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



half-way to pelvic insertion ; color darker ; breeding at small 

 size in fresh water. Range : Japan to Alaska southward to 

 San Francisco. Spawning in freshwater. Common. 

 Freshwater Smelt 55. Hypomesus olidus (Pallas) 



7b. Scales smaller, 66 to 76 along lateral line ; pelvic fins usually 

 inserted behind origin of dorsal ; fins all shorter than in olidus, 

 the pectoral not reaching half-way to pelvic insertion; color 

 more silvery; breeding at larger size in the surf. Range: 

 Alaska to central California. Marine. Abundant. 

 Silver Smelt. Surf Smelt.. 56. Hypomesus pretiosus (Girard) 



lb. Scales of small size, over 150 in the lateral line; scales on sides forming 

 two villous bands in the breeding males ; mouth large, teeth small. Range : 

 North Pacific southward to Str. Juan de Fuca, and North Atlantic Ocean. 

 Marine. Abundant. 

 Capelin 57. Mallotus villosus (Miiller) 



Family 24. Argentinidae. Deep Sea Smelt 



Range : Unalaska, Albatross Station 3330, and to California. Marine. Rare. 

 58. Leuroglossus stilbius Gilbert 



Family 25. Microstomidae. Deep Sea Fish 



Range : Coast of Washington in deep water. Marine. Rare. 



59. Bathylagus pacificus Gilbert 



Family 26. Chauliodontidae. Viper Fishes 



Range : Queen Charlotte Islands, B. C, to California. Marine. Not rare. 

 60. Chauliodus macouni Bean 



Family 27. Gonostomidae 



Range : Atlantic and Pacific oceans. Oregon to Panama (Jordan, Ever- 

 mann, & Clark 1930) 



61. Cyclothone microdon (Giinther) 



Family 28. Nemichthyidae. Thread Eels. Snipe Eels 



Range : Puget Sound, Washington to Oregon. Marine. Rare. 



62. Nemichthys avocetta Jordan and Gilbert 



Family 29. Catostomidae. Suckers 



la. Mouth terminal, lower jaw oblique, lips thin, without papillae. 



2a. Gill rakers short and shaped like the Greek letter Delta, A, with edges 

 unarmed and entire ; snout long, the premaxillary spines forming a dis- 

 tinct projecting nose; scales about 12-J-80+9; dorsal rays about 11; anal 

 9. Range : Klamath Lakes Drainage. Freshwater. Common. 

 Lost River Sucker 63. Deltistes luxatus (Cope) 



2b. Gill rakers long and not like the Greek letter Delta, A- 



