68 



THE STUDY OF INSECTS. 



PLATE II. 





A Caterpillar {Cossus Hgniperda). 

 (After Lyonet.) 

 Fig X —Caterpillar opened on the ventral middle line. Fig. 2.— Caterpillar opened on 

 the dorsal middle line. i. principal long-itudinal tracheae; 2, central nervous sys- 

 tem- -, 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. 



