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 
Toom 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 
Fic. 554.—The Stable Fly. Enlarged and piece of bread placed in 
Behual aie meena. the middle of each plate 
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 (Culicide) 
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; all 
such places provide suitable breeding ground. 
The larve are familiarly known as “ wrigglers,’”’ and live on minute 
animal or vegetable life, 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. 
