_Fig._ 124. Egg of Caradrina morpheus, mottled rustic moth--125. Egg of tortoise-shell butterfly, Vanessa urticæ--126. Egg of common footman, Lithosia complanula--127. Egg of shark moth, Cucullia umbratica--128. Maple-aphis--129. Egg shell of acarus, empty--130. Egg of house-fly--131. Mouth of Tsetse-fly, Glossina morsitans--132. Vapourer moth, Orgyia antiqua: antenna of male--133. Vapourer moth: antenna of female; _a_. branch more magnified to show rudimentary condition of the parts--134. Tortoise-shell butterfly; head in profile, showing large compound eye, one of the palpi, and spiral tongue--135. Tortoise-beetle, Cassida viridis; under surface of left fore-foot, to show the bifurcate tenent appendages, one of which is given at _a_ more magnified. This form of appendage is characteristic of the family. “West on Feet of Insects,” Linn. Trans. vol. xxiii. tab. 43-136. Egg of blue argus butterfly, Polyommatus argus--137. Egg of mottled umber, Erannis defoliaria--138. Egg of Ennomos erosaria, thorn-moth--139. Egg of Aspilates gilvaria, straw-belle--140. Blow-fly, Musca vomitoria: left fore-loot, under-surface, to show tenent hairs; _a_ _b_ more magnified; _a_ from below, _b_ from the side--141. House-fly larva--142. Amara communis: left fore-foot, under-surface, to show form of tenent appendages, of which one is given more magnified at _a_. These, in ground beetles, are met with only in the males, believed to be used for sexual purposes. These appendages are carefully protected when not in use, as explained by West--143. Ephydra riparia: left fore-foot, under-surface. This fly is met with sometimes in immense numbers on the water in salt-marshes; it has no power of climbing on glass, as seen by the structure of the tenent hairs; the central tactile organ also is peculiar, the whole acting as a float, one attached to each foot, enabling the fly to rest on the surface of the water; _a._ an enlarged external hair--144. Egg of bot-fly, the larva just escaping--145. Egg of parasite of pheasant--146. Egg of Scatophaga--147. Egg of parasite of magpie--148. Egg of Jodis vernaria, small emerald moth. PLATE VII.--_Page_ 633. VERTEBRATA.