Illustrated Studies 



91 



Illustrated Study of Beetles (Figs. 162-169). — Write the life history of the 

 Colorado beetle, or potato bug (Fig. 169), stating where the eggs are laid and describ- 

 ing the form and activities of each stage (the pupal stage, b, is passed in the ground). 



Do the same for the May beetle (Figs. 167-168). (It is a larva — the white 

 grub — for three years; hogs root them up.) Beetles, like moths, maybe trapped 

 with a lantern set above a tub of water. 



Where does a Scarab (or sacred beetle of the Egyptians, also called tumble 

 bug (Fig. 164), lay its eggs (Fig. 165)? Why? 



How does the click beetle, ox jack snapper (Fig. 166) , threw itself into the air? 

 For what puipose ? 



The large proboscis of the weevil (Fig. 163) is used for piercing a hole in which 

 an egg is laid in grain of corn, boll of cotton, acorn, chestnut, plum, etc. 



How are the legs and body of the diving beetle suited for swimming (Fig. 162) ? 

 Describe its larva. 



What is the shape of the lady bug (Fig. 97) ? It feeds upon plant lice (Fig. 185) . 

 Is any beetle of benefit to man ? 



Fig. 170. — Life history of ant lion. 



Illustrated Study of Ant Lion, or Doodle Bug (Fig. 170).— Find the pitfall 

 (what shape?) ; the larva (describe it) ; the pupa case (ball covered with web and 

 sand) ; the imago. Compare imago with diagon fly (Fig. 177). 



How does ant lion prevent ant from climbing out of pitfall (see Fig. 170) ? 

 What is on edge of nearest pitfall? Explain. 



Ant lions may be kept in a box half filled with sand and fed on ants. How is 

 the pitfall dug? What part of ant is eaten ? How is unused food removed? 



How long is it in the larval state ? Pupal state ? Keep net over box to pre- 

 vent adult from flying away when it emerges. 



