68 
THE STUDY OF INSECTS. 
PLATE II. 
A Caterpillar s Cossus Iign iper da). 
(After Lyonet.) 
FlG. i.~-Caterpillar opened on the ventral middle line. Fig. 2. —Caterpillar opened op 
the dorsal middle line. _ 1, principal longitudinal tracheae; 2, central nervous syj> 
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; io, last abdominal ganglion. 
