[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. 7. Mussel Scale-bed bug (_Mytilaspis pomorum_). _a_, male; _b_, foot of male; _c_, larva, ventral view; _d_, feeler of larva; _e_, female, ventral view. After Howard, _Yearbook U.S. Dept. Agric._ 1904. Magnified, _a, c, e_ x 20; _b, d_ x 120.]