THE DRAGON-FLY. 19 



14. Draw a ventral view on a large scale, showing 

 especially the parts of the legs, and the mouth parts. 



15. Watch a crawling beetle, to see in what order the legs 

 are moved. 



16. What can you tell of the habits of beetles? The 

 different kinds of beetles, and their development? 

 What is a grub ? Compare beetles with other insects 

 in strength. The large beetles are good insects for 

 dissecting, to show the internal structure. Beetles be- 

 long to the order Coleoptera, or sheath-winged insects. ' 



See " Classification of the Coleoptera of North America " 

 by LeConte and Horn. 



THE DRAGON-FLY. 



1. Compare the shape and relative size of the parts of 

 body with those of other insects. In some dragon- 

 flies the eyes have as many as 12,500 facets each. 



2. What kind of mouth parts has the dragon-fly ? 



3. How does the dragon-fly compare with other insects 

 in power of flight ? To what bird should the dragon- 

 fly be compared in its habits? 



4. Has the dragon-fly a sting? Is it dangerous to man 

 in any way? 



5. Watch the dragon-fly dipping the end of its abdomen 

 into the water to lay its eggs. Compare the oviposi- 

 tor with that of the grasshopper. 



6. The larva of the dragon-fly may be found on the 

 bottoms of ponds and streams, and is very noticeable 

 on account of its wide head and prominent eyes, wide 

 abdomen, and short wings. 



