68 



THE STUDY OF INSECTS. 

 PLATE II. 



A Caterpillar (Cossus ligviperdd). 

 (After Lyontt.) 

 FlG. i.— Caterpillar opened on the ventral middle line F:g 2.— Caterpillar opened on 

 the dorsal middle line. 1, principal longitudinal tracheae ; 2, central nervous sys- 

 tem ; 3, aorta; 4. longitudinal dorsal muscles; 5, longitudinal ventral muscles; 

 6, wings of the heart- 7. tracheal trunks arising near spiracles; 8. reproductive 

 organs; 0. vertical muscles : 10, last abdominal ganglion. 



