16 TRANSFORMATIONS OF INSECTS. 
insects or butterflies is formed by a single lamina or plate, com- 
mencing from two points of induration; but the more complicated 
Calosoma sycophanta. 
The beetle with the head, the portions of the thorax, and the abdomen separated and 
magnified. 
arch of the larva of the beetle results from the union of two 
series of pieces. 
The thorax is that part of the body which gives origin to the 
legs and wings. In this class of insects the thorax is invariably 
formed by the three segments which follow the head, and the 
