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. 



