FLYTRAPS AND’ THEIR OPERATION. 3 
cone trap, and usually as difficult to construct and almost as expen- 
sive. The size of these traps may vary considerably, but one con- 
structed according to the dimensions given in figure 4+ will be found 
most convenient. The height of the tent should be about equal to 
the width of the base, and the holes ((’) along the apex of the tent 
should be one-half to three-fourths of an inch in diameter and 1 
inch apart. The box (2) should be provided with hooks to pass - 
through eyes on the base (4). Small blocks 1 inch thick are nailed 
beneath the corners of the tent frame to serve as legs. 
GARBAGE-CAN TRAPS. 
As previously mentioned, Prof. Hodge has adapted the cone trap 
to use on the lids of garbage cans. It is not advisable to use this 
trap except where garbage 
cans are sufficiently open to 
admit flies. In such cases 
a hole may be cut in the lid 
of the can and one of the 
small balloon traps which 
are obtainable on.the mar- 
ket attached over the hole. 
To make the trap effective 
the edges of this hd should 
extend well down over the 
top of the can. The lid 
should be held up slightly 
so as to allow the flies to 
pass under, but not - high 
enough to admit direct 
hght. Practically  speak- 
c 
ing, the garbage forms the Vic, 5.—Top of garbage can with small balloon fly- 
i i trap attached. (Original.) 
bait for this trap, and when 
inside the can the flies are attracted to the light admitted through 
the trap. It is really advisable to have the garbage cans fly proof, 
so as to prevent danger of fly breeding within them rather than to 
depend on traps on the lids, which necessarily allow odors to escape. 
A garbage can with a trap attached is illustrated in figure 5. 
MANURE-BOX TRAPS. 
Manure pits or boxes are desirable for the temporary storage of 
manure, especially in towns and cities. These have been widely 
advocated, but the difficulty has been that manure often becomes 
infested before it is put into them, and flies frequently breed out 
before the boxes are emptied and often escape through the cracks. 
To obviate these difficulties a manure box or pit, with a modified 
