174 INSECTS, AND THEIR RELATION TO MAN 



IV. The Imago or Adult 



Observations. 1. Are there three distinct regions ? 

 2. How does the adult stage differ from the pupa stage ? 

 Conclusions. 1. What is the main function of this stage ? 

 2. Tell of the changes (metamorphoses) in the life history of 

 a moth or a butterfly. 



c. The Typhoid Fly (a Two-winged Insect) 



Observations. 1. How many body regions are there ? 

 Name them. 



2. How many pairs of legs ? Of wings ? 



Note. Two- winged insects form a group known as the 

 Order Diptera. 



3. Are the mouth parts adapted for sucking or biting ? 

 Conclusion. How do these parts compare with the similar 



parts of other insects so far studied ? 



d. A Beetle (a Sheath-winged Insect) 



Note. Pupils may well here study the following insects 

 independently of the written observations, using the summary 

 h, or their own questions. 



Observations. 1. Identify and name the body regions. 



2. How many pairs of wings ? 



3. How do the fore wings differ from the hind wings ? 

 Note. When the fore wings are sheathlike, evidently for 

 protection, such insects are known as sheath-winged insects, or 

 members of the Order Coleoptera. 



Conclusion. Define the order Coleoptera. What are the 

 mouth parts fitted for. 



e. The "Electric Light" Bug (a Half-winged Insect) 



Observations. 1. Note the body regions and the pairs of 

 legs. 



2. How do the fore wings differ from any so far studied ? 



3. Study the mouth parts. 



