Fig. 1. a, Diamond-back Moth (Plutella cruciferarum) ; b, young 

 caterpillar, dorsal view; c, full-grown caterpillar, dorsal view; 

 d, side view ; e, pupa, ventral view. Magnified 6 times. From 

 Journ. Dept. Agric. Ireland, vol. i. 



12 



