ILLUSTRATIONS. XVU 



134. Onion Fly (Phorbia repetorum) . . . 239 



135. The Cabbage-rooi) Fly ... . . 241 



136. Card disc to prevent Egg-laying of Cabbage Fly . 241 



137. Wheat-bulb Fly . . . . . . .242 



138. Mangold Fly {Pegomyia betw) .... 243 



139. Ova of Mangold Fly and Adult . . .243 



140. Gout Fly {Chlorops keniopus) . . 24,^i 



141. The Frit Fly (Oscims/ri«) . . 247 



142. Carrot Fly (Psila rosce) . . .249 



143. Celery Fly (Acidia hcrarhi) 250 



144. House Fly {Musca domestica) . . . 252 



145. Head of Stomoxys . . . 253 



146. Sheep-tick {Mclophagus ovinus) . . 255 



147. Larva and Pupa of Hen-flea [Pulex avium) 257 



148. The Hen Flea {TrichopsyUa yallinm) . 258 



149. Thrips ... .259 



150. Hop damaged by a Hemiptera-heteroptera 261 

 161. Cherry Aphis (Mi/ziis cerasi) . 263 



152. Woolly Aphis ... 266 



153. Plum Aphis (jlj3/iis prttni) . . 268 



154. Female San Jos(^ Scale . . . 269 



155. Male San Jos^ and Mussel Scale 270 



156. The Brown Currant Scale (iecaniztm ^ej'sicfc V. 7'i6is) . 272 



157. Apple-sucker {Psylla mail) .... 273 



158. A Snow Flj {Aleyrodes) , ..... 275 



159. Needle-nosed Hop-hug {Calocoris fulvomacidahcs) 277 



160. Louse of the Ox (Scematopinus euryslernus) 279 



161. Migratory Locust (JEdipoda migratoria) 280 



162. Female and Male common Cockroach (j6toto oricniffii.s) . 282 



163. Mole Cricket (Gryllotalpa vulgaris) . . 283 



164. Trichodectes sphcerocepJmlus of Sheep . . . 285 



165. Mallophaga or Bird-lice . . . 285 



166. Lace-wing Fly . . . 286 



167. Dragon-flies (Jlsohna grandis) . ... 288 



168. Silver Fish {Lepisma saccharina) . 289 



169. Edible Sn&il {Helix pomatia) ..... 292 



170. Two Transverse Series of Teeth from Radula of Limpet . 294 



171. Shells of Lamellibranchs . . . . .294 



