INSECT ENEMIES 



PLANT-LICE 



The plant-lice or aphides are perhaps the most 

 common of the insect enemies found on house 

 plants. (Fig. 19.) There are numerous forms 



Fig. 19. Plant-lice greatly magnified 



of these, two of which are of frequent occur- 

 rence, one being black and the other green. The 

 black form is seldom found except on chrysan- 



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