PLATE I. 



A Catekimllak (Cossus ligniperaa). 



( After Lyonet.) 



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

 middle line. 1, principal longitudinal tracheae ; 2, central nervous system ; 3. aorta ; 4. longi- 

 tudinal dorsal muscles ; 5. longitudinal ventral muscles; 6. wings of the heart ; 7, tracheal trunks 

 arising near spiracles ; 8, reproductive organs; 9, vertical muscles; 10, last abdominal spiracle. 



