Fig, 56. — A.'itacuft flticmtilis. — The structure of the cuticle, ^.trans- 

 verse sec I ion of a joint of the forceps ( x -i) ; *, setse ; B, a por- 

 tion of the same ( x 30) ; C, a portion of B more highly magnified. 

 a, epiostracum ; h. ectostracum ; c, endostracum ; d, canal of seta ; 

 e, canals filled with air ; s, seta. D, section of an intersternal 

 membriine of the abdomen, the portion to the right in the natural 

 condition, the remainder pulled apart with needles ( x 20) ; E, 

 small portion of the same, highly magnified ; a, intermediate sub- 

 stance ; b, laminse. F, a seta, highly magnified ; a and h, joints. 



