Index 



Natural Selection, no 

 nectar, loi 

 Nematocera, 20 

 Nemopteridae, Fig. 28 

 Nepa, respiration of, 115 

 Nepidae, 16 



swimming of, 76 

 nerve-system, 30, 32 

 Neuroptera, 16; Figs. 18, 26, 28 

 New Zealand Glow Worm, 95; Figs. 75, 



night-flying insects, 25 

 Notonectidae, 16 



swimming of, 76, 115 

 mmibers of insects, fluctuation of, 120 

 nuptial flights, 49 



of ants, 106 



of termites, 98 

 nutrition of insects, 45 

 nymphs, 6, 53; Figs. 12-14, 20, 23, 24 



obtect pupae, 57 

 ocelli, 



dorsal, 60 



lateral, 62 

 Odonata, 13 

 oesophagus, 30 

 olfactory pits. Fig. 42 

 oligopod larvae, 55 

 ommatidium, 59 

 Onychophora, 4 

 ootheca, 52 

 Orders of Insects, 8 

 Orthoptera, 9 



feeding of, 42 

 Osmia, 10 1 

 oviduct, 49 

 oviposition, 49 

 ovipositor, 22, 30, 50; Fig. 14 



palpi, 26 



Parasitica, 22^ Figs. 59, 63 

 parasitic insects, 20, 22, 25, 128 

 parthenogenesis, 49 



of aphids, 92 

 penis, 48 

 Pentastomida, 3 

 pentatomid bugs. Fig. 10 

 Peripatus, 4 

 Perlaria, 12 

 pharate adult, 57, 74 



pharynx, 30 



Phase Theory of Locusts, 89 



Phasmida, 10 



phragma, 72 



Phthiraptera, 15 



pigments, in insects, 48 



pincers, of earwigs, 113 



plague, 130 



plagues of caterpillars, 93 



plant bug. Figs. 11, 12 



plant lice, 16, 92; Figs. 13, 20 



Plecoptera, 12 



Polistes wasps, 100 



pollen, 10 1 



pollination of flowers, 130 



polyembryony, 52 



polypod larvae, 55 



Pompilidae, 100 



pond-skaters, 76 



population, growth of, 93 



populations of insects, 120 



praying-mantis, 10, in; Fig. i 



predatory insects, in 



preventive measures, 125 



primitive insects, 4 



proboscis. Figs, n, 25 



prolegs, 3, 20, 21, 22, 56, 73; Fig. 15 . 



pronotum. Fig. 14 



prothorax, 27 



Protozoa, intestinal, 14, 98 



Protura, 9 



pseudopods, 3, 20, 21, 22, 56, 73; Fig. 15 



psocids, 14 



Psocoptera, 14; Fig. 6 



Pterygota, 4, 9 



Ptychomyia remota, 124 



pupa, 7, 56; Fig. 15 



puparium, 7, 57 



queens, 



of social insects, 97 



of ants, 104 



of bees, 103 



of termites, 14, 98 



of wasps, 100 



radiation, evolutionary, no 

 raptorial fore-legs, in 

 receptaculum seminis, 48 

 rectal gills, 13 

 rectum, 30 



137 



