THE STUDY OF INSECTS 



PLATE II 



Internal Anatomy of a Caterpillar (Cossus ligniperda). 



Fig. 4. — Caterpillar opened on the ventral middle line. Fig. 5. — Caterpillar opened on the dorsal 

 middle iine. 1, principal longitudinal tracheae; 2, central nervous system; 3, aorta; 4, longitudinal 

 dorsal muscles; 5, longitudinal ventral muscles; 6, wings of the heart; 7, tracheal trunks arising near 

 spiracles; 8, reproductive organs; o, vertical muscles; 10, last abdominal ganglion. (After Lyonet.) 



