FIELD WORK ON HEMIPTEEA. 



103 



lagging across the sidewalk; and whenever you find one 

 do not hesitate to catch it. After examining it, it is to be 

 consigned to the killing bottle— a pest well gotten rid of. 

 (Fig- 45-) When you seize the insect by its broad back, 

 do not be frightened by the furious noise that it makes — 

 it is only noise, and not at all dangerous. Can you dis- 

 cover the "musical apparatus" on the under side of 



Fig. 45. — Development of a cicada. Cicada tibicen. A, imago emerging from 

 nymphal skin; B, the cast skin; C, imago. Natural size. (Folsom.) 



the body? Are the wings half opaque or wholly mem- 

 branous? Can you discover the beak? How does the 

 cicada carry the beak ? Are you able to find one of the 

 insects feeding? 



If in some green-house, or elsewhere, there are plants 

 that are troubled with scale insects, an expedition may 

 profitably be made to see the insects, or a branch of the 

 plant afflicted may be secured for study. Examine the 

 scale as it lies on the stem. Has it any means of defense? 



