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THE STUDY OF INSECTS. 

 PLATE II. 



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A CATERPILLAR (Cossus ligniperita). 



(After Lyonet.) 



FiG. 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. 



