376 OHIO EXPERIMENT STATION: BULLETIN 332 



PLATE XXIII 



THE BAG OR BASKET WORM 

 ( Thyridopteryx ephemerae formis ) 



Fig. 1. Branch of hard maple badly mutilated by the feeding caterpillars. 



Fig. 2. A small hard maple tree, Cincinnati, Ohio, almost defoliated by 

 the bag worm. 



