774 



INDEX. 



Trachea:, ascending thoracic, 226 



atrium of, 352 



changes during ccdysis, 48 



closed, 358 



development of, 353, 368 



ecdysis of intima, 356 



embryonic, in pupa, 427 



histolysis of, 306 



influence of, on after-develop- 

 ment, 427 



intra-cellular, origin of, 273 



longitudinal trunks, 352 



morphology of, 355 



movements in, 383 



new branches of, 368 



origin of, 357 



relations to blood, 367 



relations to pseudo-haemal sys- 

 tem, 358 



spiral thread in, 355 



structure of, in imago, 364 

 in larva, 48 



transverse, 225 



vestibule of, in imago, 352 



in larva, 50 

 Tracheal capillaries, 49 



arrangement of, 367 



development of, 49, 273 

 Tracheal gills, 160, 351, 355 

 Tracheal intima, 48 



ecdysis of, 307 

 Tracheal system, 351, 358 



development of, in nymph, 338 



ideal plan of, 225 



of imago, 358 



of larva, 47 



of nymph, 338 



Tracheal vessels. Sec Tracheae 

 Trematodes, generative organs of, 721 



origin of ova in, 708 



yelk-glands of, 708 

 Trichogenic cells, 10, 279 

 Trichosoma, thorax of, iSS 

 Trito-cerebron, 442 

 Trochanter, 192 

 Trochantin, 179 

 Trophic nerve-cells, 289 

 Tuba of oviduct, 666 

 Tubular nerve fibres, 289 

 Tuffen West on Fly's foot, 196 

 Tymbals of Cicada, 601 

 Tympana of Orthoptera, 599 

 Tympanic air-sacs, 217 



bulla:, 169, 184 



Tympanic fissure, 187 



membrane, 624 



notch, 185 



organs, 623, 626 



ridge, 185 



spiracles, 363, 624 

 Tympanules, 584 

 Typhlopone, absence of eyes in, 516 



corpora fungiformia of, 446 



UNCINATE process of parascutum, 



176 



Ungues, 194 

 Unguiculus, 201 

 Urates in distal intestine, 430 

 Utero-vaginal tube, 675 



development of, 703 

 Uterus, 675 



VAGINA tubiformis, 745 

 Valve of lingual duct, 406 

 Valve plate of sp ; racles, 363 

 Valves, intra-ventricular, 641 



in larva, 91 



intra-tracheal, 366 



of dorsal vessel, 638 

 action of, 652 

 of larva, 90 



of ostia of dorsal vessel, 641 



of posterior spiracle, 361 

 Van Beneden. See Beneden 

 Van Rees. See Rees 

 Vanessa, development of retina in, 



543 



lo, development of oviducts in, 



704 



Vas deferens, 664 

 Vas efferens, 662 

 Velocity of flight, 386 

 Ventral appendages, 8, 14 



abdominal, 731 



thoracic, 158 

 Ventral chain of ganglia, 62 



development of, 479 



nerves of, 64 



Ventricles of the brain, 447, 448, 488 

 Ventricles of the dorsal vessel, 638 



in larva, 87 

 Verloren on accessory hearts, 636 



on action of dorsal vessel, 651 



on valves of dorsal vessel, 641, 



652 



Vermiform larva?, 19 

 Verschluss Band, 363 



