10 FARMERS’ BULLETIN 734. 
punched a series of holes “’ about one-half inch in diameter and 1 inch 
apart. The apices of the folds on either side of the window should 
not be directly opposite. A narrow door / opening downward on 
hinges should be made on one side of the trap at the bottom for 
removal of the dead flies. The entire trap is fastened to the win- 
dow by hooks so that it may be readily taken off. An additional 
trapping feature may be added by providing a tent trap fitted in the 
bottom of the box. A narrow slit is left along the base to allow the 
flies to enter beneath the tent. Bait may be placed under the tent to 
attract the flies. 
Fic. 7.—Hodge type window trap. At left, trap with end removed to show construction ; 
at right, cross section of trap placed in a window. A, End of trap. B, Upper side of 
folds in screen. (C, Lower side of folds in screen. D, Portion of end of trap sawed out 
and returned after attaching screen. #, Holes along apex of folds. F, Door for remoy- 
ing dead flies. G, Window sill. H, Upper window sash. J, Inside entrance for flies. 
O, Outside entrances. (Author's illustration. ) 
It has been found that the use of these window traps will aid 
in protecting animals in barns from stable flies and mosquitoes, and 
in some cases horsefiies and other noxious species are caught. 
BAITS FOR TRAPS. 
The question of selecting the best bait for flies is an important 
one. As has been indicated, the kind of bait used should be gov- 
erned by the species of flies which it is desired to destroy. For the 
most part it is the house fly which it is desired to catch, and for 
this insect waste beer is preeminently the best bait. In some cases 
