494 



ANNUAL REPORT SMITHSONIAN INSTITUTION, 19 64 



Disorder 



Jack pine sawfly 



young larvae find it difficult to 

 penetrate the pine leaf cuticle 



Tailor, ants 



ants begin to pull at places wide 

 apart but leave places hard to bend 



"Wood ants 



at first many ants gather round the 

 prey, pulling in all directions 



Figure 1. — In many group activities a definite pattern of development is seen, as shown 



successful, when order is 



