36 



A GUIDE FOR THE STUDY OF ANIMALS 



Summary of Important Points from the Table 



1. What characters are common to all the insects de- 

 scribed in the table ? 



2. What are the various types of wings ? Why do they 

 vary ? 



3. What are the various types of legs ? How are they 

 characterized ? 



4. What are the various types of mouth parts ? 



5. Show how the variations in insects are related to the 

 habitat and mode of hfe of the insect. 



Al 

 A2 

 Bi 

 B2 

 Ci 



El 





9. KEY TO THE PRINCIPAL ORDERS OF INSECTS 



Insects with no wings. (See list below.) 



Insects with wings 6 



With fwo pairs of wings. (See Note i below.) . C 



With one pair of wings Diptera 



Both pairs of wings aliis in structure, either mem- 

 branous or scaly D 



Fore and hind wings unlike in texture, fore wings 

 fold over hind wings E 



Both pairs of wings membranous, not covered with 



scales F 



Both pairs of wings covered with scales ; mouth 



parts tubular for sucking Lepidoptera 



Fore wings very smooth, sheath or shell- like, meet- 

 ing in a straight line when folded; legs 

 adapted for walking, running, or swimming; 

 mouth parts for biting Coleoptera 



Wings not as in E^ I 



Wings membranous, usually folded or partly 

 folded; few nerves G 



Both pairs of membranous vrings usually outspread, 



many nerves ; mouth parts for biting . . . H 



Wings membranous, hooked together and partly 

 folded, or outspread, y«» nerves in the wings; 

 mouth parts for both biting and sucking; re- 

 gions of the body usually very distinct . . . Hymenoptera 



