724 



INDEX 



Penis, 180; velum of, 181. 



Pericardial cells, 405; diaphragm, 402; 

 septum, 574. 



Periopticon, 231, 253. 



Peripatus, 9, 580 ; nephridia of, 349 ; tra- 

 chea of, 443. 



Peripodal cavity, 669; membrane, (369; 

 sac, 653. 



Periplaneta, 72, 370 ; egg-tubes of, 501 ; 

 tongue of, 72. 



Peritoneal membrane, 444. 



Peritracheal circulation, 397; membrane, 

 444. 



Peritreme, 90. 



Peritrophic membrane, 313. 



Perlidfe, 69, 468, 491, 493. 



Pen-is, on organs of smell, 266. 



Phagocytes, 421, 650, 655, 680, 683, 685. 



Phagocytosis, 421. 



Phauaeus, 61 ; reduced tarsi of, 101. 



Phanreus pegasus, 188. 



Phaneroptera, 44. 



Pharynx, 302. 



Phasmidfe, eggs of, 521. 



Phosphorescence, 424 ; physiology of, 426. 



Photogenic organ of beetles, 424. 



Phragma, 93. 



Phryganea, 455. 



Phyllium, 521. 



Phyllocnistis, 606. 



Phyllodromia, 506; embryology of, 541, 

 563, 583; eversible glands of, 370; fat- 

 body, origin of, 575 ; micropyle of eggs 

 of, 523; pleuropodia of, 551 ; origin of 

 sexual organs of, 576, 578-580 ; mode 

 of hatching, 583 ; ootheca of, 519. 



Phytonomus, 617. 



Phytophagous larva?, 606. 



Pictet, on blood gills, 475. 



Pieris, 39,614; embryology of, 546; green 

 pigment of, 206; post -embryonic 

 changes of, 651 ; wing-germs of, 133. 



Pigment, 183, 203 ; chemical nature of, 

 206 ; of eye, 253 ; physical nature of, 

 206. 



Pits, olfactory, 271. 



Planta, 638. 



Plant ula, 97. 



Plate, extensor, of foot, 116; pressure, 

 116. 



Plateau, on digestion, 324; on functions 

 of ganglia, 244; on muscular power, 

 217; on respiration, 453; on vision, 

 256, 259. 



Platycrania, 521. 



Platygaster, hypermetamorphosisof, 701 ; 

 sexual cells of, 581. 



Platypsyllus, 62. 



Platysamia, 460. 



Platyzosteria, 371. 



Plectoptera, 459, 466. 



Pleuropodia, 476, 551, 583. 



Pleurum, 87. 



Plumules, 198. 



Pocock, on classification of myriopoda, 

 12, 21. 



Podurida?, 574. 



Poisonous spines, 191, 199. 



Poisons, effect of, on pulsations, 412 ; on 

 hairs, 191, 199. 



Poison apparatus, 357 ; glands, 357 ; nat- 

 ure of, 357. 



Polar cells, 580. 



Polymitarcys, 467. 



Polymorphous insects, 597. 



Polynema, hypermetamorphosis of, 702. 



Polynephria, 354. 



Polyphemus silkworm, 621. 



Polypodous ancestor of insects, 22 ; em- 

 bryos, 550. 



Polypody, 550 ; suppression of in dipterous 

 embryos, 707. 



Pore-canals, 188. 



Porthesia, 529. 



Postfurca, 92. 



Post-gula, 54, 68. 



Post-retinal fibres, 231, 232. 



Postscutellum, 87. 



Pouch, copulatory, 505. 



Poujade, on flight, 159. 



Poulton, on the differences between the 

 limbs of the pupa and imago, 628. 



Pra'scutum, 87. 



Pratt, on absence of polypodous embryo 

 in Muscidne, 55 ; on the dorsal position 

 of the stomoda'um of Diptera, 537; 

 on epigenetic period, 68S ; on fate of 

 the leucocytes, 685 ; post-embryonic 

 changes of Melophagus, 686 ; signifi- 

 cance of metamorphosis, 688; on wing- 

 buds, 127. 



Preantennal appendages, 548. 



Premaudibular segment, 51, 52, 549. 



Press of spinning apparatus, 341. 



Primitive band, 531 ; streak, 531. 



Prionocyphon, 472. 



Prisopus, 69, 477. 



Proboscis, 446. 



