CONTROL OF THE HOUSE FLY AND RELATED FLIES 163 



all places where flies congregate, as markets, eating places, packing 

 houses, etc., the liberal use of good fly traps is a very good measure. As 

 baits for such traps the following suggestions have been made. 



1. ISIilk. 



2. Overripe or fermenting bananas, crushed and placed in the bait 



pan. 



3. Bananas and milk are better than either separately. 



4. A mixture of 3 parts water, 1 part molasses, is good after it has 



fermented for a day or two. 



^^-. 



!•«= 



Fig. 35. — Conical hoop fly trap; side view. A, Hoops forming frame at bottom. B, 

 Hoops forming frame at top. C, Top of trap made of barrel head. D, Strips 

 around door. E, Door frame. F, Screen on door. G, Buttons holding door. H, 

 Screen on outside of trap. I, Strips on side of trap between hoops. /, Tips of 

 these strips projecting to form legs. K, Cone. L, United edges of screen form- 

 ing cone. M, Aperture at apex of cone. (Bishopp.) From Farmer's Bull, U. S. 

 Dept. Agr., No. 734, figs. 5, 1. 



5. A mixture of equal parts brown sugar and cheese or curd of sour 



milk, thoroughly moistened, is good after it has been allowed 

 to stand three or four days. 



6. Mucous membrane from the lining of hogs' intestines is attractive 



to blow-flies and other meat-infesting flies, as well as the house 

 fly. This is available for fly traps at packing houses. 



7. Ordinary fish and meat scraps. 



8. Moistened garbage. 



These baits are of little value if allowed to dry out. It is not uncom- 

 mon to see fly traps standing out in the sun near garbage cans, with no 

 flies within but plenty of flies around, and the bait dried out by the 

 sun. The fly trap must be more attractive than its surroundings. When 

 baits arc used which will permit of the development of maggots in them, 



