344 ZOOLOGY 



1. How is locomotion effected ? Illustrate by diagrams. 



2. How does the larva feed? Observe and record the movements 

 of the mouth-parts and of the head during feeding. Draw the outline 

 of a partly eaten leaf. 



3. (This observation must extend through several days.) Make and 

 record observations upon the act of pupation. 



TOPICS FOR FURTHER STUDY 



1. The habits and food of butterflies. 2. The number of broods of 

 butterflies during a single season and seasonal dimorphism. 3. Pro- 

 tective resemblance and mimicry. 4. The larger divisions and com- 

 moner native forms of Lepidoptera. (Examples of Lepidoptera 

 illustrating the commoner native types should be shown and students 

 encouraged to collect and classify them.) 5. The Hymenoptera : 

 their structure, classification, and habits. 



III. BEETLE 



The May-beetle and the potato-beetle are recommended for studies 

 from alcoholic specimens. If these are not available for the " Obser- 

 vations on the Living Animal," any other slow-creeping species 

 may be employed. 



DRAWINGS 

 (From alcoholic specimens) 



1. Dorsal view, naming parts, x 8. 



2. Remove the antenna, mandible, maxillae, and legs of right side. 

 Draw posterior view of each part. Use lens, x 15. 



3. Remove the wing case and membranous wing from left side. 

 Draw wing (a) folded, (b) unfolded, indicating position of creases. 

 Draw imaginary cross-section of the folded wing. 



4. Draw beetle- from left side, indicating position of removed 

 wings, x 8. 



5. (Optional.) Draw larva from left side, x 8. 



QUESTIONS ON EXTERNAL ANATOMY 



1. How many segments has the beetle behind the head? 



2. (Optional.) How many segments has the larva? 



