774 INDEX, 
Trachez, ascending thoracic, 226 
atrium of, 352 
changes during ecdysis, 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-hzemal 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. See Trachez 
Trematodes, generative organs of, 721 
origin of ova in, 708 
yelk-glands of, 708 
Trichogenic cells, 10, 279 
Trichosoma, thorax of, 188 
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 
bullze, 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 spiracles, 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 
Io, 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 larvae, 19 
Verschluss Band, 363 
