more like birds than insects, 

 and they are known to be great 

 travelers. It is presumed that 

 those which are in the eastern 

 and middle-western states go to 

 the south during the cold 

 weather, while those which 

 winter near Pacific Grove come 

 from a large part of the coun- 

 try lying west of the Rocky 

 mountains. There is one place 

 where they may be seen each 

 autumn on the wing, a flight so 

 great that it takes a day for 

 them to pass a given point. 

 This is in a pass of the Siskiyou 

 mountains, about a hundred 

 miles west of the railroad. 

 Here, in the latter part of Sep- 

 tember, a long stream of them 

 travels down through the hills 



29 



