646 



TEXT-BOOK OF ENTOMOLOGY 



in the Coleoptera, Trichoptera, and the more generalized and primi- 

 tive Diptera, eaeh segment and appendage of the larva are directly 



transformed into the corresponding parts of 

 the pupa, and subsequently of the imago. We 

 * shall see, however, beyond, that this general 

 statement does not apply to the Hymenoptera, 

 in which there is a process of cephalization 

 or transfer of parts headward, peculiar to that 

 order. 



The change in the internal organs. These 

 were especially, as regards the nervous sys- 

 tem, first carefully examined and illustrated 



-A- 



Fi<;. Ms. 



FIG. .W.t. 



-/J ""*& 

 FIG. 600. 



Km. .")'. s. Internal organs of XjiJtina- liffimfri : 1, head ; '2-4, thoracic, 5-18, abdominal seg- 

 ments; I r , fore-, Jf. mid-. K, hind-inti'stim- ; </x, hrain ; f/i, infraoesophageal <ranslion ; n, ven- 

 tral ^inL'liiin ; ////, iii-inary tiilu-s; c, In-art ; (r, ti^lis ; o, (i^oiiha-fiis ; rt, anus; m, alary muscles of 

 the- In-art. 



Fin. .V.tfl. Pujia of the same. 



Fiii. 000. Iinatro of I lie satin-. This and Figs. 50S and 509 after Newport, from Gegenbaur. 



by that great English entomotomist, Newport, and those of the 

 reproductive organs by Herold as early as ISlo. A glance at the 

 figures (598-G04), reproduced from Newport's article Insecta, will 



