68 



THE STUDY OE INSECTS. 

 PLATE II. 



r - * 



A Caterpillar ^Cossus ligniperda). 



(After Lyonet.) 



Fte. t. — Caterpillar opened on the ventral middle line. Fig. 2.— Caterpillar opened op 

 the dorsal middle line. 1, principal longitudinal tracheae ; 2, central nervous sy!y 

 tem : 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. 



