17. Leg. 



1 8. \Vings. 



19. Pro-legs. 



20. Cerci. 



THE AX A TO MY OF INSECTS. 



APPENDAGES OF THE THORAX. 

 ,7,.. Coxa.'7'''- Trochantin - 



APPENDAGES OF THE ABDOMEN. 



21. Caudal setae. 



22. Claspers. 



23. Ovipositor. 



24. Sting. 



25. Honey-tubes. 



THE INTERNAL ANATOMY OF INSECTS. 



In order to obtain a clear idea of the relative positions of the 

 different systems of organs in the body of an insect, let us recall 

 the type of the Arthropoda described in the Introductory Chapter. 

 A^iagrammatic representation of this type is given in Fig. 36. 



(U 





FIG. 36. Diagram of structure of Arthropoda. 



The body-wall IS a hollow cylinder; within this the \ iVrr.i are 



follows: The ulinu-nt.uy canal is central: tin- 

 of the nervou ntral; and tin- circulatory system, 



dorsal. To this simple conception it will l>e m-i 



in. imi il by the 1. !ir<>- 



. and tli production, the 



n of which was omitted from tl 



// .S'X-</ t i of an iiiM-ct i- 



chiefly.. re prolongations ,,f it into th 



cavity. As these form support f<-i n hm< nt 



:nany muscl< M! skeleton. 



