PROC. EXT. SOC. WASH., VOL. XV. 



PLATE V. 



ABOVE. SECTION- OF POTATO FROM PERU, SHOWING LARVAE OF Rlngop- 

 sidius lucutiHi/tiix IN ITS BURROW. 

 BELOW. SEorio\i.;n POTATO SHOWING BURROWINGS OF Rhigopsidius. 



