MOSQUITOES 



135 



A fly trap. 



every ten days so that the flies cannot have a chance to 

 breed. Garbage and any material that might form a breed- 

 ing place should be carefully removed within the ten-day 

 period. One of the best baits for flies is made by adding 

 to a pint of milk and 

 water two tablespoon- 

 fuls of formaldehyde. 

 Place a piece of bread 

 in a shallow dish and 

 almost cover it with 

 the poisonous dose. An 

 excellent home project 

 would be the manu- 

 facture of an efficient 

 fly trap. The United 

 States Government bulletins, for example, Farmers' Bulle- 

 tin No. 927, or Hodge's Nature Study and Life give de- 

 scriptions of excellent traps. 



In addition to the house fly, many other flies, as the 

 stable fly, the fruit fly, and the black fly, cause us great 

 annoyance, and some are believed to carry disease. 



Mosquitoes. We have all at one time or another 

 been annoyed by mosquitoes. They render some parts 

 of cities and towns unfit for human residence, not only 

 because of their bite, but because they carry malaria. 

 The old belief that malaria was caused by bad air has 

 long been exploded, for experiments have proved that a 

 certain kind of mosquito, the anopheles, is responsible for 

 carrying this disease. A careful study of the diagram will 

 show how we can distinguish between the harmless culex 

 and the harmful anopheles. The harmful one, as you 

 notice, stands with its body oblique while the culex holds 



