OF THE ORDER COLEOPTERA. 287 



the commencement of August, he says, this larva issues from 

 the water, and gets upon the large leaves of such plants as 

 grow there, where it fixes, and shuts itself up in a small 

 oval shell, made of some substance derived from its own 

 body. In this shell, having assumed the form of nymph, 

 it gets out of it under that of the winged insect, towards the 

 end of the same month, and jumps suddenly into the water. 

 This author adds, that these nymphs are very subject to be 

 devoured by the larvae of the ichneumons, which lay their 

 eggs near them in the same shell. 



