pond life. 103 



The Structure and Habits of Stone-flies 

 {School Work). — Write an account of what jou have 

 learned regarding stone-flies. Describe first the ap- 

 pearance of these insects ; illustrate this by two 

 sketches, one showing the appearance of the insect as 

 seen from above with the wings closed, the other an 

 enlarged view of the head and prothorax as seen from 

 above, and compare the eyes and antennas with those 

 of dragon-flies and May-flies. In the second part of 

 the account state what you have learned regarding 

 the habitat and habits of stone-flies. 



Copy the following label and place it above the 

 stone-flies in your collection (see footnote, page 3) : 



Order Plecoptera (Ple-cop'te-ra). 

 The Stone flies. 



Other Insects that fly Over Ponds {Field 

 Work). — During the field days, when you are studying 

 pond life collect any insects that you find flying over 

 ponds or resting near them. These should be care- 

 fully pinned, labeled, and preserved in your collec- 

 tion for future study. 



INSECTS THAT LIVE ON THE SURFACE OF WATER. 



In the excursions that have been made for the 

 purpose of studying pond life, the pupils have proba- 

 bly observed certain insects running over the sur- 

 face of the water as if it were a firm pavement. 

 We purpose to study carefully some of these insects, 

 but before doing so it will be well to endeavor to 

 understand how it is that these creatures can per- 

 form the apparent miracle of walking upon water. 



