Genus Scytonotus 
49 
Fig. 31. Comparative distributions of species of Scytonotus in western 
North America. 1, insulanus ; 2, bergrothi; 3, simplex ; 4, inornatus; 5, 
columbianus; 6, piger. The boundary line of 5. insulanus is continued 
through the ocean off British Columbia and Alaska to show that the dis- 
tribution excludes the Queen Charlotte Islands. 
