i8 A GUIDE FOR THE STUDY OF ANliviALS 



of the wings ? Do the two cover (fore) wings meet in a 

 straight line or do they cross at their tips ? Are they 

 smooth throughout and sheath-like, or are they thick at the 

 base and thin at the tips ? 



Summary. 



Summarize your study of the bug by enumerating the 

 various .ways the bug is adapted for life in the water. 



Water Beetles 



Use the same questions for the study of water beetles as 

 for water bugs. In addition answer the following : — 



I. Identify the eyes of the whirligig beetle and note their 

 peculiar construction. How can you explain this peculiar 

 form of the eyes on the basis of use .■' Why are the antennae 

 of both water bugs and beetles so small .? 



Suggested drawings. 



a. The dorsal view of both bug and beetle. 



b. Ventral view of the bug's head to show the beak and 

 first pair of legs. 



GETTING ACQUAINTED WITH THE LIBRARY 



Directions. 



The books in a zoological library may be roughly divided 

 into three groups : — 



1. Reference books. 



a. Advanced textbooks. 



b. Elementary textbooks. 



c. Natural histories. 



d. Books for classifying or naming animals. 



2. Descriptive books. 



e. Life histories and habits of animals. 



