INDEX, 755 
Cuvier on absence of circulation in 
Insects, 636 
Cycloraphic Diptera, 29 
lunula of, 125 
Cynomyia mortuorum, 31 
Cytogenic cells, 274 
tissue, 274 
DEGLUTITION in imago, 402 
Delamination of nervous layers, 484 
Deltoid sclerite, 203 
Dens, 199 
Dereham on fly’s foot, 196 
on halteres, 616 
Dermato-genetic cells, 480 
Desvoidy. See Robineau ~ Des- 
voidy 
Deuterocerebron, 442 
Deuteroplasm, 708 
Development, effect of temperature 
on, 4 
of embryo in egg, 230 
bibliography of, 230, 292 
of nymph, 292 
See also under each organ. 
Dewitz on closed trachez, 358, 380 
on development of external 
generative organs, 731, 733 
on development of limbs in 
vermiform larvae, 21 
on passage of gases through in- 
tegument, 379 
on relation of spiracles to gills, 
371 
Diaphragmata, 106 
Diarthrosis, posterior thoracic, 171, 
183 
Dietl on antennal ganglion, 590 
on Marksubstanz, 66 
Dilator pharyngis muscle, 390 
Dimmock on proboscis, 398 
Dioptric theory of vision, 560 
illumination of the retina in, 575 
Dioptron, 515 
of Blow-fly, 526 
pigment cells of, 530 
structure of, 526 
tracheze of, 530 
See also Compound eye 
Diplostichous ocelli, 512 
Diptera cheetophora, 11 
development of, in egg, 230 
eremocheta, II 
Diptera, ganglia in, 64 
general characters of, 25 
larvee of, 27 
metamorphosis of, 20 
nematocera, 30 
relations of, to other insects, 26 
sub-orders of, 29 
wings of, 164 
Direct nuclear division, 270, 271 
Directive corpuscles, 714 
Disc. See Imaginal disc 
Disc holder, 212 
Discal area, 198 
Discal sclerites, 143 
Discophore, 148 
Dissecting microscope, 212 
Dissection, directions for, 211 
Distal intestines of larva, 58 
Distal retina of Parker, 531 
Dogiel, nerves of, 478 
Dohrn on development of nervous 
system, 481 
on development of Malpighian 
tubules, 423 
on metenteron of Hymenoptera, 
423 
on relations of Insects to Verte- 
brates, 109 
Dolichopus, anterior legs of, 191 
genital armature of, 739 
Dolium, 183, 187 
Dominant sensations, 497 
Donacia, amoeboid movements of 
yelk in, 715 
Dorsal aspect of the thorax, 166 
Dorsal muscles, 187, 223 
action during respiration, 377 
development of, 336 
functions of, 187, 377 
histology of, 283 
Dorsal organ, 17, 254, 255 
Dorsal plate. See Dorsal organ 
Dorsal valve of thorax, 175 
Dorsal vessel, bibliography of, 635, 
656 
development of, 656 
Dorsal vessel of imago, 639 
alar muscles of, 637, 647 
Dorsal vessel, demonstration of, in 
action, 655 
dissection of, 639 
histology of, 644 
inhibition of, 655 
physiology of, 650 
