FIELD WORK ON THE DIPTERA. 



177 



prepared to do just these things in your community, and 

 you may be one of the victims ; hence the only safe thing 

 is to kill every one of them after finishing up the investi- 

 gation work. It will be best to put a piece of mosquito 

 bar over the cup to catch any adults that may emerge 

 while you are not watching. Can you find any such 

 adults? 



FIG. 72. A blow fly or flesh fly. (Kellogg, after Lugger; natural size indicated 



by line.) 



After you have had the family under observation 

 for several days, use the reading glass often to keep track 

 of what is going on. If in your neighborhood there are 

 some suspected breeding-places for mosquitoes, visit 

 them and take along your bottle of oil. 



Learn for yourself that house flies and stable flies 

 breed in filth, by finding their larvae or maggots in manure 

 or refuse piles. If you will keep your eyes open, you may 



