Bui 59 Bureau of Entomology, U S Dept. of Agnculturi 



Plate VI. 



Lvj^r.;, CoM.^L;,.^, f ,^^e. 



ji-IFtriATluN. 



Fig. 21.— <i, Point of orivriniil egK pniuiiin' mul tirst proliii-ratioii; h. liirvu cruslu'd by prolifenition 

 irowding iiiM.ii it fn.m nil ■Iir.<tii.iis. Eiilttrgi'il four rtiamoters. (Original.) 



