398 



TRANSFORMATIONS OF INSECTS. 



tube, which is pierced at its extremity by two orifices, which are 

 surrounded by a crown of small hairs. The larva chooses shallow 

 waters to swim about in, and when it requires air and a supply 



THE METAMORPHOSES OF Stratiomys chamcBleo. 



of breath, it sticks up the end of its body and elongates the last 

 segments, and respires through the two holes just mentioned. 

 After a longer or shorter larva life, the insect comes up to the 

 surface of the water and floats ; it does not change its shape, but 



