INDEX. 
ABDOMEN, 12 
imaginal discs of, 329 
respiratory movements of, 376 
tracheze of, 226 
Abdominal cavity, contents of, 217 
Abdominal fold in pronymph, 303, 
318 
Abdominal integument, development 
of, in nymph, 328 
Abdominal segments, development 
of, 729 
nomenclature of, 724, 727 
number of, in embryo, 15, 729 
number of, in larva, 33, 730 
Abdominal spiracles, 363, 364 
Abdominal terga in male, 738 
Absorbent cells, 279 
Acalypterata, 30 
Accessory nucleus. See Paranucleus 
Accommodation of compound eye, 
532, 566 
Acephalous larvae, 27 
Acheta, antennze of, 594 
anterior tubercle of, 464 
cerebron of, 454 
corpora fungiformia of, 462 
corpus centrale of, 459 
nerve to ocelli of, 467 
Achromatin, 266 
Acilius, spiracles of, 157 
Aconic eyes, S19 . 
Acrididee, Miiller’s organ in, 600 
Active nucleus. See Nucleus 
Aculeus of Hymenoptera, 729 
Adenoid cells in larva, 85 
Adenoid reticulum, 274 
Aerial insects, 11 
air-sacs in, 224 
Aecrostats, 217 
/Zschna, development of male organ 
In, 731 
movements of wing in, 164 
Air-channels of proboscis in pupa 
398 
Air expired during flight, 383 
Air-sacs, 224 
appearance of, 365 
azygos, 398 
modifications of, 365 
of proboscis, 396 
sternal, 226 
structure of, 365 
thoracic, 217 
Airy on sound-waves, 619 
Alar apophysis, great, 175 
of scutellum, 176 
Alar muscles, 637, 647 
Alar syndesmosis, 167 
Alary nerves, 64 
Alimentary canal, 227, 389, 407 
bibliography of, 389 
changes of, in nymph, 311, 331 
comparative morphology of, 51 
development of, in embryo, 421 
development of, in nymph, 331, 
426 
histolysis of, 311, 312 
of imago, 227, 389, 407 
ofimago and larva compared, 227 
of larva, 55 
of resting larva, 3 
relations of, in imago, 22 
Ametabola, metamorphosis of, 1g 
number of eggs in, 19 
Amnion, 241 
developed from epiblast, 16 
relations to primitive band, 241 
Ameeboid cells, 265 
