350 PESTS OF THE HOUSEHOLD AND STORED PRODUCTS 



But in addition we must look to the breeding places, especially manure 

 heaps. Usually the most feasible plan of caring for these is to inclose 

 or otherwise screen them. If the manure can be removed once a 



week, flies cannot complete 

 their life round in it. 



An effective means of 

 poisoning flies that have 

 already gained access to a 

 room is as follows : 



Add two tablespoonfuls 

 (1 ounce) of 40 per cent 

 formalin to one pint (16 

 ounces) of sweet milk, or 

 of equal parts milk and 

 water. Pour this out in 

 shallow plates, so that flies 

 can get at it easily. A 

 piece of bread placed in 

 the middle of each plate 



Fig. 



554. — The Stable 

 natural size. 



Fly. Enlarged and 

 Original. 



will allow more space for flies to alight and feed. 



Catching flies by means of traps, or with sticky fly paper, is a uni- 

 versal practice, and helps in reducing the numbers within a room, but 

 the method described above will usually be found more rapid and 

 effective. 



Mosquitoes {Culicidce) 



Mosquitoes are of many species, but most have at least one point 

 in common ; their immature stages are found in stagnant water. They 

 do not require breeding places of large area. An open rain-water 

 barrel, an old watering trough, tin cans containing rain water; aU 

 such places provide suitable breeding ground. 



The larvae are familiarly known as " wrigglers," and live on minute 

 animal or vegetable hfe, beneath the surface of the water. They must 

 come to the surface occasionally to breathe. Following the larval, 

 there is an active pupal stage, preceding the emergence of the adult. 



