A 



YOUNG EGGS 



FAT BODY 



B 



WAX 

 GLANDS 



INTESTIN 



OVIDUCT 



MALPIGHIAN 

 TUBULE 



TRACHEAE 



FIG. 22. The cochineal insect and its food-plant. 



A, Dactylopius cacti, female and male. B, transverse section through the abdomen of a 

 female, c, Xopalea coccinellifera, a specimen in the Oxford Botanic Gardens. The white 

 strip of cardboard is lo cm long. D, female D. cacti attached to A', coccinellifera. 



(A from Hartwig; -^' B from Mayer; ^^^ c, photograph by the author, reproduced by 

 permission of Prof. C. D. Darlington; D from Blanchard.^") 



