IV ILLUSTRATIONS. 



28 Wasp-fly {Chrysotoxum fasciolatum), 91 



29 Father long-legs {Pedicia rivoci), together with the 



poisers and the winglets, 93 



30 Death's-head hawk-moth {Acherontia Atropos), 96 



31 Heads of the death's-head hawk-moth, showing expe- 



riments respecting sound, 97 



31 Anobium tesselatum, a death-watch beetle, magni- 



fied, 101 



32 Anobium striatum^ a death-watch beetle, magnified, ib. 



33 Anobium pertinax; a death-watch beetle, magnified, ib. 



34 Acanthocinus csdilis, 110 



35 Adela De Geerella, male and female, ib. 



36 Ear of the crab, 117 



37 Eyes of My gale avicularia, 125 



38 Mi/gale ccementaria, ib. 



39 Lycosa vorax, ib. 



40 Dolomedes niarginatus, ib. 



41 Ctenus dubius, ib. 



42 Sphasus indianus, ib. 



43 Attus parus, ib. 



44 Eresus cinnaberinus, ib. 



45 Thomisus citreus, ib. 



46 Clubiona accentuata, ib. 



47 Dysdera erythrina, ib. 



48 Segestria perfida, 126 



49 Tegenaria domestica, ib. 



50 JEpeira diadema, ib. 



51 Thoridion coronatum, ib. 



52 Latrodecta 13 guttata, ib. 



53 Argyroneta aquatica, ib. 



54 Head of the worker-bee, 127 



55 Eyes of the male bee, ib. 



56 Tetrops prceusta, 128 



57 Eyes of ditto, greatly magnified, ib. 



58 Gyrinus natator, ib. 



59 Eyes of ephemera, greatly magnified, ib. 



60 Eyes of the bee, greatly magnified, 131 



61 Section of the eye of the dragon-fly, 133 



62 Section of the eye of the stag-beetle, 138 



63 Section of a compound eye, showing the course of the 



light, 139 



64 Giant cockroach, (JBlatta gigantea), 152 



65 Praying mantis (Mantis religiosa), 157 



66 Virgin dragon-fly {Calepteryx Virgo), 160 



67 Tongue of the bee, with its muscles and sheath, 172 



68 Structure of the bee's tongue, 173 



