INDEX 



471 



Osmia, nesting habits, 104-105 ; 



family life, 21O 

 Ova, 9-10, 118-120 

 Ovary, 141 

 Oviducts, 143 

 Ovipositor, 143-145 

 Oxygenation, 4, 39-40, 43-44 



Pachycondyla, 252 

 Pachysima, larvae, 244-245 

 Paedogenesis, 196 

 Pairing, 200-308 

 Palaeodictyoptera, 337, 346 

 Panama Canal and insect-borne 



disease, 435 

 Papilio dardanus, gynandromorphs, 



135 ; mimicry, 372-373 

 Paramecoptera, 341 

 Parasites of insects, 407-416 

 Parasitic insects, 109-110, 387-388, 



398-407 

 Paratrichoptera, 342 

 Parthenogenesis, 10, 13 7- 141 

 Passalidae, family hfe, 213 

 Paussidae, 250 

 Pediculus and typhus, 437 

 Perga lewisi, parental care, 214 

 Periplaneta, jaw-muscles, 61-65 ; 



introduction into Britain, 425 

 Permian period, insects of, 337-340 

 Phototropic reaction, 93 

 Pieris brassicae, modification of 



pupal colour, 363 

 Planema, 374-375 

 Planipennia, 315, 341 

 Plants and insects, 382-397 

 Plasmodium in mosquitoes, 431 

 Plasticity in behaviour, 111-113 

 Plecoptera, characters, 311; develop- 

 ment, 332 ; geological 



history, 339 

 Plesiocoris rugicollis, in, 393 

 Podura aquatica, 281 

 Polar-bodies, 119-120 

 Pole-cells, 359-360 

 Pollen as bees' food, 225, 394.-395 

 Pollination of flowers by insects, 



394-395 

 Polyergus rufescens, 246-247 

 Polygynous wasp communities, 223- 



224 

 Polyommatus astrarche and 



artaxerxes, 355-356 

 Pompilidae, nesting habits, 102- 



104 ; characters, 320 



Poataiiia salicis, change in habits, 



364-365 

 Pontomyia natans, 291-292 

 Porthctria dispar, scx-moditication , 



133-135 ; ^ pest in North 



America, 423 

 Precis octavia and sesamus, 370-371 

 Prepupa, 193-194 

 Prevision, 107 

 Protective resemblance, 272-273, 



369-371 



Proteins, composition, 16 ; digestion 

 and absorption, 30 



Proteoclastic ferments, 30 



Protcphemerida, 338 

 j Protohymenoptera, 343 

 I Protoperlaria, 339 

 I Protoplasm, 16 

 ' Protorthoptera, 337 

 1 Protozoa, parasitic in insects, 409- 



! 414 



' Proventriculus, 25-27 



Pselaphidae, 250 



Pseudacraea, 374-375 



Pseudococcus, 221 



Psyllidae, 165-167 



Pterygota, 307 



Ptinidae, 271, 425 

 I Pupa, 172-176, 191-195 



Puparium, 1 91-194 

 : Pupipara, I95 , ^ 



Purpose in activity, 94-96, no 



Pyrameis cardui, range and migra- 

 tion, 263-264, 304 



Pyrrhocoris, sperm-cells, 126 



Qx;EENS,of wasps, 222-225 ; of bees, 

 226-234 ; of ants, 237, 247- 

 248 ; of termites, 255-256 



Racial memory, no, 159-160 

 Reciprocal feeding, 224-225. 243, 



257-258 

 Rectum, 32 

 I Reducing division, 117-120, 126 

 Reflex action, 8, 70-72, 95-96 

 Relationship, 325 ; of insect orders, 

 327-346 ; of insects to other 

 Arthropoda, 346-349 

 ! Reproduction, 10, 114-149 ; 

 I abnormal, 195-199 



, Respiration. See Air-tubes, 

 Breathing, Oxygenation. 



