SENSATION AND REACTION 



8i 



Fig. 27. — A, Lateral view of metathorax {th) and the first three 

 abdominal segments (i, 2, 3) of male Uraniid moth (Chrysiridia 

 ripheus), scale-pad removed to expose vesicle (v) and tympanum (t) of 

 ear ; s, spiracles. X 6. B, Internal view of tympanum [t), with muscle 

 bands (w), chordo tonal organ (ch) and ganglion (g) ; v, cut edge of 

 vesicle. X 20. C, Thoracic ganglion (G) and nerve-cord (n) with 

 branches to tympanal organs (to), X 8. D, Chordo tonal organ of 

 female, with scolopales (s), ganglion cells (nc) and tracheal sheath (ir). 

 X 400. After H. Eltringham (Trans. Entom. Soc. 1919). 



G 



