xvi TEXT-BOOK OF ENTOMOLOGY 



PART III. THE METAMORPHOSES OF INSECTS 



PAGE 



a. The nymph as distinguished from the larval stage .... 593 



ft. Stages or stadia of metamorphosis 594 



c. Ametabolous and metabolous stages 694 



THE LARVA .V.i'.i 



a. The Campodea-form type of larva 600 



ft. The cruciform type of larva 602 



c. Growth and increase in size of the larva 608 



d. The process of moulting 609 



The number of moults in bisects of different orders . . . 615 



Reproduction of lost limbs 619 



Formation of the cocoon 619 



Sanitary conditions observed by the honey-bee larva, and admis- 

 sion of air within the cocoon 623 



THE PUPA STATE 625 



a. The pupa considered in reference to its adaptation to its surround- 

 ings and its relation to phylogeny 631 



ft. Mode of escape of the pupa from its cocoon 632 



c. The cremaster 636 



Mode of formation of the cremaster and suspension of the 



chrysalis in butterflies >>''>' 



FORMATION OF THE PUPA AND IMAGO IN THE HOLOMETABOLOUS INSECTS 



(THE DIPTERA EXCEPTED) 641 



a. The Lepidoptera 642 



The changes in the head and mouth-parts 646 



The change in the internal organs 647 



The wings 654 



Development of the feet and of the cephalic appendages . . 654 



Embryonic cells and the phagocytes 655 



Formation of the femur and of the tibia; transformation of 



the tarsus 656 



The antennae 657 



Maxillae and labial palpi 658 



Process of pupation 660 



ft. The Hymenoptera 601 



Ocular or oculo-cephalic buds 6ti5 



The antennal buds 6i>f> 



The buds of the buccal appendages 665 



The buds of the ovipositor 665 



DEVELOPMENT OF THE IMM.O IN THE DIPTERA 666 



a. Development of the outer body-form 668 



Formation of the imago in Corethra 668 



Formation of the imago in Culex 670 



