Knowledge. 



CORN APHIS. 



Vv'iNt-i :male. 



APHIDES DESTRUCTIVE TO GRAIN. 



Showing winged and wingless forms, viviparouslv produced larva, and empty skin from which an internal parasite has escaped through the hole at 

 the end. In all of these the two cornicles, from which honey-dew issues, will be observed pointing backwards at the hinder end of the body. 



From a lantern slide lent by Messrs. Newton, of No. 3, Fleet Street. 



Direct Photo Engraving Co,, 9, Barnsbury Park, N. 



