List of Illustrations. 



FlO. PAGE, 



179. AuAmpMpod. ..... .217 



180. Transverse section of the thorax of Gammarus 218- 



181. 1, 2 Caprella acutifrons, 3 Cyamus mysticeti 218 



182. Palsemon. . . . 220' 



183. Zosea of a Prawn . . 221 



184. Mysis-stage of Penmus . 222 



185. A young Lobster-larva . 224 



186. Newly-hatohed Crayfish . 224 



187. Phyllosoma 225. 



188. Larvae of a Crab 22& 



189. Squilla ... 227 



190. Digestive tract of Lithobius . 228- 



191. Newly-hatched larva of a Diplopod . . . 228- 



192. Head and anterior body segments of a Scolopendra . 229 



193. Transverse sections : Aoi a, Chilopod, B, D of different Diplopods . 230. 



194. Antennae of various Insects 231 



195. Diagram of the mouth parts of various Insects 232 



196. Diagrammatic transverse sections of the proboscis of various Insects 233 



197. Transverse section through the thorax of a Beetle . . . 235 



198. Diagram of the principal anatomical points in an Insect . . 237 



199. Nervous system of various Insects . . . 237 



200. Diagrammatic longitudinal section of the head of an Insect with sucking 



mouth-parts 238- 



201. Diagram of the chief trunks of the tracheal system of an Insect. 239 



202. Portion of a trachea from a GaU-fly larva . . 239 



203. Apparatus for closing the trachea of a Beetle 240- 



204. Portion of the heart of an Insect . 242 



205. Ovariole of an Insect 242 



206. Female genital organs of the Cockchafer 243 



207. Male genital organs of the same . 243 



208. Females of three allied species of Geometridse 244- 



209. Slastophaga grossorum . 245 



210. Larva, pupa, and imago of a Sphinx 248 



211. Larva and pupa of a Wasp 250' 



212. Termes ludfugus 254- 



213. Lepisma . . 255 



214. Abdomen of Machilis 256. 



215. Phylloxera vastairix 258- 



216. 1 Cimex lectularius, 2 Pediculus capitis, 3 Plithirius pubis 260' 



217. Chrysopa. 



218. Panorpa communis . 



219. Boreus hiemalis 



220. 1-4 Xenos Bossii, 5 X PecTcii 



221. A Abdomen with ovipositor of one 



of the spine and the lobes . 



222. Heads of Honey-bees 



223. Psyche . 



224. Culex 



225. Gastrus . 



of the Uroceridse, B Transverse section 



261 

 261 

 261 

 262' 



268 



271 

 274- 

 276 

 27r 



