[Illustration: Fig. 3. Head of Caterpillar of Goat-moth (_Cossus_) seen from behind. _At_, feeler; _Mn_, mandible; _Mx_, maxilla; _Lm_, labium, spinneret projecting beyond it. Magnified. After Lyonet from Miall and Denny"s _Cockroach_.]

[Illustration: 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.]