£^^6 h ant nest 6e/a^v orc/inary 

 p/ow furrow. \ 



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/7p/)/ofs rn/gfrafih^ to nevi/' corn f/e/at \A^/}ere 

 t/)ey orQ aas/stect h roots 6y ants. 



PiQ. 4. — Diagram showing history of the com root-aphids and its relatticns with the cornfield 



