Habits, and Power for Injury. 



101 



travel in one direction from the time of hatching until 

 maturity. They travel, on an average, not more than six 

 hours per day ; and their unfledged existence terminates 

 in from six to eight, say seven, weeks. It is very easy to 

 calculate from these facts that if they continued in one 

 direction from the time they hatch until they acquire 

 wings, they could not extend thirty miles. In reality^ 

 however, they do not travel every day, and where food 

 is abundant they scarcely travel at all. Moreover, as just 

 shown, they do not commence traveling till after the first 



[Fig. 15.1 



American Aceidium. 



molt, and they do not go continually in a particularly 

 eastern direction, but in all directions. 



We have already seen that the winged insects take a north- 

 west direction, and do not fly to the east. Yet in 1 875 a few 

 stragglers were carried as far as the centre of Missouri by 

 being swept into the Missouri river arid drifted on logs and 

 chips during the annual rise of that river in July. These 

 soon become lost to view; for most of them are intestate 

 or diseased, and if they should lay eggs the young hatch 

 early in the fall and perish at the approach of winter. 



NOT LED BY " KINGS " OR " QUEENS." 



The idea that the young hoppers were led in their 

 marches by so-called "kings" or "queens" has been, 



