Fig. 69. Seedling mountain ash photographed June 25, 1913 to show 

 colony of woolly aphids which are the progeny of migrants from elm leaf 

 rosette caged with mountain ash, June 17, 1913. Two apterous generations 

 matured on this seedling, but the third generation proved too much for the 

 little tree which was so nearly dead by August 10 that the last of the aphid 

 colony perished at that time. 



The antenna of one of the winged progenitors of this colony is shown 

 as Fig. 81. 



