480 
tion, 64; ranthodice, distribution of, 
366 
Pigmental colors, 194 
Pigments, wor eyes, *Dro0; 111, *1r2, 
tr13is nature iof, 1953 of, Pieride; 
196 
Pilikersy .A 2 
Pimpla, 312 
Pine, insects of, 252 
Pinguicula, 257 
Placodeum, *95 
Planta, *270 
Plants, insectivorous, 256; insects in 
relation to, 252 
Plasma, 127 
Plasmodium, *300, 301 
Plateau, on color sense, 115; muscu- 
lar power, 88; respiration, 139; 
416, 423, 427, 429, 432, 435, 459 
Platephemera, *386 
Plathemis, abdominal appendages of, 
"72 antenna, “34 
Platner, 434 
Platygaster, 
167, *176 
Platypsyllus, 278 
Platyptera, defined, 11, *12; origin of, 
Zan t25 
Plecoptera, defined, 13, *14; nymph, 
*162; Origin, 23, *25 
Pleistocene insects, 385, 391 
Pleurites, 48, *49 
Pleuron, 47 
Plotnikow, 423 
Pocock, 412 
Podical plate, *73 
Podisus, egg of, *159; predaceous, *307 
Pecilocapsus, color changes of, 215 
Pogonomyrmex, 340 
Polar bodies, *146 
Poletajeff, N., 424 
Poletajew, O., 435, 445 
Poletajewa, 432 
Polistes, behavior of, 360, 365; habits, 
329; wing vibration, *64 
Polttes, on Iris, *267 
Pollenizers, insect, 266 
Pollination, 259, 266; of Iris, *260, 
*261 ; milkweed, *262; orchids, 262; 
Yucca, *264 
Pollinia, *262 
Polybia, 328 
Polyergus, 336 
Polygoneutic, 204 
Polygonia, dimorphism of, 202; egg, 
*159 
Polymorphism, 202, 330 
Polynema, 177 
hypermetamorphosis of, 
INDEX 
Polyphemus (see Telea) 
Polyphylla, assembling of, 103 
Polyrhachis, 333 
Pompilus, behavior of, 360, 364 
Porthetria dispar, damage by, 
hermaphroditism, *144; 
4138 
Post-gene, 30 
Postscutellum, *48 
Potato beetle (see Leptinotarsa) 
Pouchet, 434, 459 
Poulton, on adaptive coloration, 230, 
231, 234; on colors of larve and 
pup, 197, 198; 444, 447, 448, 449, 
450, 451 ‘ 
Powell, 444 
Pratt, 444 
Predaceous insects, 276, *307; in rela- 
tion to birds, 291 
Premandibular, appendages, *150; seg- 
ment, 45 
Primitive insects, 21, 22 
Primitive streak, 148 
Primordial insect, 21 
Prionus, assembling of, 103; eggs, 161 
Proboscis, *42 
Procephalic lobes, *149, *150, *152 
Proctodeum, 117, “120, *ra9 
Proctotrypidz, 27, 311 
Prodoxus, 266 
Prodryas, *390 
Prognathous, 11 
Promethea (see Callosamia) 
Pronotum, *48 
Pronuba, *264, *265 
Propodeum, 46, 66 
Propolis, 323 
Protective, adaptations, 297; mimicry, 
*224, 233; resemblance, *216, 220 
Prothorax, 46 
Protocerebrum, 90, 152 
Protoplasm, adaptive, 243 
Proventriculus, 118 
Pseudocone, *112 
Pseudomyrma, 273 
Psocide, *12 
Pteronarcys, 13, *14; tracheal gills of, 
135 
Pterygota, 10 
Ptilodactyla, antenna of, *34 
Pulvillus, 51, *54 
Punktsubstanz, *93 
Pupz, 156, 167; emergence of, 171; 
protection, 169; respiration, 169 
Pupal stage, significance of, 177, 183 
Puparium, 168 
Pupation of a caterpillar, 168 
Putnam, on habits of Bombus, 328 
397 5 
trachee, 
