THE STABLE FLY, 25 
TRAPPING THE FLIES. 
It is impossible successfully to capture adult flies by means of the 
traps ordinarily used for the house fly. However, a trap has been 
designed by Prof. C. F. Hodge which may be utilized in capturing 
adults as they enter or leave barns. This trap is undoubtedly very 
effective under certain conditions and has the advantage of catching 
not only the stable fly but the house fly and other obnoxious species. 
In order to employ the trap for the stable fly it should be built in 
a frame so as to fit 
closely in a window, 
preferably on the 
brightest side of the 
barn and close to the 
cows or horses which 
are kept within. Other 
windows should be 
darkened by hanging 
gunny sacks over them. 
This may be done so as 
not to interfere with 
ventilation, and by flap- 
ping in the wind and 
darkening, both drive 
and cause the flies to 
be attracted to the 
light trap-window. 
Prof. Hodge has very 
kindly permitted the 
use of some of his illus- 
trations of this trap 
(figs. 8, 9, 10), and his 
description of its con- 
struction has also been 
followed. At the bot- Fig. 8.—The Hodge flytrap, showing where the flies enter. 
= ( After Hodge.) 
tom of the trap a 
space about one-fourth of an inch wide running entirely across the 
window is left on both sides of the frame. This crack admits the 
flies beneath a roof or ridge of screen wire having holes large enough 
for flies to go through punched along its top at 2-inch intervals. 
In order to capture the house fly, bait consisting of any material 
which is attractive to them is placed in pans beneath this ridge. 
The flies enter this space and then ascend through the holes and are 
unable to escape. The sides of the trap, also, are made of ordinary 
screen wire bent inward and upward in two horizontal folds running 
540 
