PARKS 



The trap is set on a level surface either on the ground or floor or on a 

 stand two or three feet in height. The bait is placed in a flat, shallow con- 

 tainer under the trap, and when the fly has finished feeding it will crawl up 

 through the small holes in the screen into the main part of the trap. The 

 trap can be emptied by first immersing in water or flaming, to kill the flies, 

 and then loosening the wooden buttons and slightly depressing the small 

 triangle, or opening the small door. The flies will slide out when the other 

 end is raised. 



The most effective fly baits consist of either putrefactive or fermenta- 

 tive substances. Putrefactive baits soon become so malodorous as to con- 

 stitute a nuisance, but while fer- 

 mentative baits have a distinct 

 odor, it is not unpleasant. Of the 

 latter the following have been found 

 to be efficient: (a) Bran, n ounces; 

 corn meal, 5 ounces; syrup, 4 

 ounces; water, I pint. () Over-ripe 

 bananas and sour milk, (c) Corn 

 meal, I part; molasses (syrup), 2 

 parts; water, 5 parts; yeast 

 (bakers'), as needed to produce the 

 necessary fermentation. Of the 

 putrefactive baits, fish heads, fish 

 scraps, or canned salmon are the 

 best. Traps should be placed in 

 kitchens, around garbage cans, 

 toilets or wherever flies are 



TRANSVE.RSE, 

 SE.CTION 



PLATE No. 357 

 THE HODGE WINDOW SASH FLYTRAP 



numerous. 



The Hodge window sash flytrap, as shown in Plate 357, is quite efficient 

 and has the advantage that no bait is required. Flies are attracted by 

 light and this tendency is utilized in the operation of the Hodge trap. A 

 frame is made to fit the window opening and held in place by the sash 

 coming down onto it or by fastening to the side of the window opening. 

 The frame is four to five inches in depth, covered on the outside by screen- 

 ing, while on the inside the screening is arranged in small triangles or pyra- 

 mids, one above the other, with the apices pointing upward and outward. 

 At the apex of each triangle a small hole the size of a lead pencil is punched 

 through the screening. The fly, in endeavoring to reach the light, enters 

 the broad base of the triangle and crawls upward through the hole in the 

 screen. The flies are killed by flaming and removed through an opening 

 with a sliding metal door in the lower part of the trap. Certain modifica- 



