Entomology of Southern Alaska. 233 



fourth of the Glenora species are found also at the Canon 

 while only about one-elev^enth extend to the Coast. 



6. That the fauna of Glenora is apparently less related to 

 that of the Coast than to that of the interior or of the North- 

 east; and 



7. That the fauna of the Canon is more closely related to 

 that of the Coast than to that of the interior or the East. 



Reference to the accompanying maps will throw some 

 light on the problems here suggested. Glenora is on the 

 inside of the great Coast Ranges while the Little Canon is 

 regarded by Dr. Dawson as marking the head of the old salt- 

 water inlet that has been silted up. This \yould account for 

 much in the distribution of the species in question. The cli- 

 mate of the country above the Canon is also much dryer and 

 with greater extremes of heat and cold than on the Coast. 

 Aside from the influence of the barrier of the Coast Mountains 

 interposed between faunae which might tend to intermingle, 

 the change of plants consequent upon difference in climate on 

 opposite sides must also have its effect on the insects depend- 

 ent on vegetation for foojd. 



These, then, are the conclusions as to probable faunistic 

 affinities to which our figures seem to lead us; and while 

 they may be modified with larger collections before us, it is 

 hoped that these notes, made before the hand of civilization 

 has swept away the native fauna and replaced it by one of its 

 own, will not lose their value. 



