8o 



STRANGE DWELLINGS. 



lengthened period, and after these members have served the 

 purpose for which they were intended, they are broken off by 

 the insect by means of a transverse seam near the base. There 



MVKAlLLhCN, 



AMPULLX. 



are, however, many of the permanently winged hymenoptera, 

 which possess very great powers of burrowing, and are able to 

 excavate soil so hard that a knife can scarcely make its way 

 through the solidly impacted mass of earth and stones. 



