XVI CONTENTS 



PAGE. 



140. Skin of nymph from which Dragon-fly has emerged 175 



141. A Bird-louse (Eurymetopus taurus) 175 



142. A Caddis-fly (Leptocerus dilutus) 176 



143. The home of the Stone-fly and the Caddis-fly 178 



144. Young Mantis on the lookout for prey 178 



145. Full-grown Mantis patiently waiting for an opportunity 



to seize any small, unwary creature 180 



146. A Mole Cricket (Oryllotalpa borealis) 181 



147. Broad-winged Katydid 181 



148. A Thrips 183 



149. Box-elder Bug (Leptocoris trivitattus) 184 



150. An Assassin-bug (Melanolestes picipes) 184 



151. Giant Water -bug (Belostoma americana) 185 



152. Cicada and cast-off nymphal covering 185 



153. Newly hatched Scale insect 186 



154. Female Scales (Aspidiotus greenii) 186 



155. Adult female Scale insect (Kermes nivalis) 187 



156. An unprotected Scale 187 



157. Adult female Scale (Kermes pubescews) 188 



158. Protected Scale insects 188 



159. Protected Scale insects 189 



160. Adult male Scale insect (Aspidiotus ancylus) 189 



161. A Water Scavenger (Hydrophilus triangularis) 189 



162. A Click Beetle (Alaus oculatus) 190 



163. Wood-boring Beetle at work 190 



164. A Snout Beetle (Sphenophorus ochreus) 191 



165. A lake overgrown with lilies 192 



166. The " Humming-bird " Moth (Phlcgethontius celeus) . . 193 



167. Luna Moth (Actias luna) 194 



168. " Pitcher " pupa of " Humming-bird " Moth 195 



169. A Skipper (Endamus [Thorybes] bathyllus) 195 



170. Interrogation Butterfly (Grapta interrogationis) 195 



171. A Fly (Sarcophaga cimbicis) and its pupa-case 196 



172. A Robber-fly (Erax cinerascens] with pupa-case 197 



173. A Flea (Ceratopsyllus serraticeps) 197 



174. A wood-boring Hymenopteron, the Pigeon Horn-tail 



( Tremex columba ) 198 



175. Parasitic Hymenopteron (Thalessa lunator) drilling... 200 



176. Map showing habitat of the Swallowtail Skipper (Euda- 



mus proteus ) 203 



