12 A BOOK OF INSECTS 



Kay Lankester, the smallest inseet of all is a "water beetle 

 called Nanosella which is only one-hundredth part of an 

 inch long. Thus, in point of size, insects occupy an inter- 

 mediate place among animals. Some are smaller than the 

 largest Protozoa — the living atoms revealed by the micro- 

 scope in a drop of water; others are larger than the 

 smallest vertebrates, such as shrews and mice. 





