128 



polyphagous habit, or the ease with which it accommodates itself to so 

 great a variety of phiuts. These are the three characteristics which 

 most concern the practical man and which make it oue of the most dif- 

 ficult species to contend with. 



Fig. 27. Icerya purchaid, female larva, third 

 stage — enlarged (after Eiley). 



Fig. 28. Icerya purchasi, male pupa, ventral 

 view — enlai-ged (after Eiley). 



''A very long list of plants might be enumerated upon which this 

 insect is either found accidentally or upon which it can live more or 

 less successfully. But the list of plants, especially of trees, important 

 to us for their products, which are seriously affected by it is compara- 



i 



Fig. 29. Icerya 2)t(rcha>ii, adult male, enlarged ; a, joint of antenna ; 6, tip of tarsus ; c, wing pocket 

 and books, still mors eul.irged (after Kiley). 



