FIELD WORK ON HEMIPTERA. 



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? 



