68 



THE STUDY OF INSECTS. 

 PLATE II. 



A CATERPILLAR '^Cossus ligniperda). 

 (After Lyonet.) 



ffV*. T. Caterpillar opened on the ventral middle line. FIG. 2. Caterpillar opened on 

 the dorsal middle line, i, principal longitudinal tracheae ; 2, central nervous syi- 

 tern; 3, aorta ; 4, longitudinal dorsal muscles; 5, longitudinal ventral musclesr 

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

 organs ; 9, vertical muscles : 10, last abdominal ganglion. 



