1 8 Practical Zoology. 



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

 power of flight? To what bird should the dragon fly be com- 

 pared 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 ovipositor with that of the 

 grasshopper. 



6. The larva of the dragon fly is called a nymph. It 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. 



7. When the larvae are ready to transform, they crawl up out of 

 the water, their skins split along the back, and the adult dragon 

 flies escape, leaving their dry, empty skins, which may be found 

 clinging to the stems of water plants, projecting logs, or rocks. 



8. Draw a dorsal view. 



9. The dragon fly belongs to the order Odonata, or nerve-winged 

 insects. 



THE SQUASH BUG. 



1. Find the sucking tube bent back under the thorax. 



2. Are there both simple and compound eyes? 



3. What peculiarities of the prothorax? 



4. Draw a dorsal view, showing how the wings overlap. 



5. Fasten the squash bug's wings out at right angles to the 

 body, and make another drawing, showing how the outer wings 

 appear when extended, and how the inner wings are disposed. 



6. Draw a ventral view. 



Look for eggs. Compare young and old squash bugs. Squash 

 bugs belong to the order Hemiptera, or half-winged insects. What 

 is the propriety of this name? Insects belonging to this order 

 are the only ones that are properly called "bugs." 



Topics for Reports. The Periodical Cicada. Plant lice. The 

 Cochineal Insect. Scale Insects. The Chinch Bug. 



