POND LIFE. 101 



7. In the evening, examine the street lamps or 

 other lights, and note the extent to which the May- 

 flies are attracted to them. 



The Habits of May-flies (School Work). — Write 

 an account of what you have learned regarding May- 

 flies. Copy the following label and place it above 

 the May-flies in your collection (see footnote, page 



93):— 



Order Ephemerida (Eph-e-mer'i-da). 



TAe May-flies. 



The Structure of May-flies [School Work). — 

 It is quite difficult to preserve specimens of May- 

 flies in good condition for study, as they shrivel 

 greatly on drying. We will call attention, therefore, 

 to only a few of the more important points in the 

 structure of these insects. 



1. Study the head and observe the following: 

 The very large compound eyes — in dried specimens 

 these are apt to be more or less shriveled, and in 

 some kinds of May-flies each compound eye is di- 

 vided into two distinct parts; the simple eyes or 

 ocelli — in some of our more common species these are 

 much larger than is usual with insects ; the mouth- 

 parts — these are absent or represented by minute 

 rudiments. May-flies take no food during their very 

 short existence in the adult state. Make a sketch of 

 the head seen from above. 



2. Study the wings and make a sketch showing 

 the outline of each of the two wings of one side. 



3. Write out a statement of the points of resem- 

 blance and the points of difference between the wings 

 of May-flies and those of dragon-flies. 



