71. Back dark, with numerous small yellowish spots; northern states 



Cristivomer namaycush (Walbaum) Lake Trout, Togue 

 Spots darker than body color 72. 



72. Scale count about 120; males with red blotches; breeding males with the 



lower jaw strongly hooked upwards; north Atlantic, entering rivers 

 south to Cape Cod 



Salmo salar Linn. Atlantic Salmon 

 (Landlocked subspecies "sehago") 

 Scale count more than 130; western species, also introduced into the 

 eastern states 73. 



73. With a red streak on each side of the lower jaw along the inner sides 



of the mandibles; males sometimes with red coloring on the sides; tail 

 spotted 



Salmo clar\\i (Richardson) Cutthroat Trout 

 (Trutta clar\ii (Richardson) ) 

 No red streaks so situated; usually with a reddish band along each side; 

 tail not spotted in young (Formerly considered to be two species, the 

 silvery, sea^going "Steelhead" and the heavily spotted, fresh-water 

 "■Rainbow") 



Salmo gairdnern (Richardson) Rainbow Trout or Steelhead 

 (Licludes Salmo shasta (Jordan) or Salmo irideus Gibbons) 



74. Anus jugular 75. 

 Anus in the normal position before the anal fin 81. 



75. Pelvic fins thoracic; eyes normal; about seven to eight inches long; N. Y. 



to Texas; Family Aphredoderidae 



Aphredoderus sayanus (Gilliams) Pirate-perch 

 Pelvic fins absent or else very small and abdominal; eyes very small or 

 absent; less than six inches long; Family Amhlvopsidae Cave Fishes 



76. 



76. With small eyes; body colored; no pelvic fins 77. 

 Eyes concealed; body colorless; with or without pelvic fins 79. 



77. Sides brown, unstriped; underground streams of Kentucky 



Forhesella agassizii (Putnam) Kentucky Cavefish 

 With three dark stripes on each side 78. 



78. With ridges of sensory papillae on the sides of the body; in Illinois caves 



Forhesella papillifera (Forbes) Illinois Cavefish 

 No sensory papillae on sides of body; in swamps of southern states 

 Chologaster cornutus Agassiz; Rice-ditch Fish 



79. With small pelvic fins; caves of Kentucky and Indiana 



Amhlyopsis spelaeus De Kay Mammoth Cave Blindfish 

 No pelvic fins 80. 



80. Pectoral fins not reaching back to the anal fin; cave streams from Indiana 



to Alabama 



Typhhchthys suhterraneus Girard Small Blindfish 

 Pectoral fins reaching back to the insertion of the anal fin; caves of Mis' 

 souri and Arkansas 



Troglichthys rosae (Eigenmann) Missouri Cavefish 



267 



