68 



THE STUDY OF INSECTS. 

 PLATE II. 



A CATERPILLAR {Cossvs 



(After Lyonet.) 



FlG. i. Caterpillar opened on the ventral middle line. FIG. 2. Caterpillar opened on 

 the dorsal middle line. i, 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 ; 9, vertical muscles : 10, last abdominal ganglion. 



