ERRATA 



Page 62, 10th line from bottom, he did not notice should read he 

 did notice 



Page 95, line 2. complete should read complex. 



Page 117, 2nd line from bottom. Throughout this swarming period, 

 etc. should read: At the beginning of this swarming period, the 

 larvae are few and small ; at the end they are few and large. For 

 the greater part of the time they are abundant and there is 



Page 134, line 3. eggs of Woods Holl should read eggs at Woods Holl 



