64 



GRASSHOPPERS AND OTHER INJURIOUS INSECTS OF 1911 AND 1912. 



long, as shown in our figures. Three of these traps were deHvered 

 to this Division, two rectangular, and one of the shape shown in 

 illustrations, which by the way indicate very well the plan of con- 

 struction. These traps have been given a thorough test with most 

 satisfactory results, no difl'erence being noted due to the difference 

 in shape. The screen used is the ordinary wire mosquito screen, 

 and that and the small amount of lumber required made each trap 

 cost us forty-one cents for material. A skillful carpenter can make 

 such a trap in about three hours or less. The upper oval part (c) 



Fig. 43. Stable Flies, 10,211 caught 

 over cow in one day. Hodge. 



Fig. 44. An easily construc- 

 ted fly trap. Hodge. 



serves as a receptacle which the flies enter through the openings in 

 the top of the middle portion (b) made of screen and shaped like 

 the roof of a house. Under this is the base board (a), upon which 

 rest two tin bait pans. All three parts are held together by the 

 hooks at each end, as shown. Space between baseboard and middle 

 portion (between a and b) about one-half inch, and between this 

 and bait pans through which space flies enter pans, about one- 

 fourth inch. Figure 3 shows a cross-section of the trap, the arrows 

 indicating how the flies enter the bait pan and then ascend through 

 the 10 or 12 openings above into the large receptacle. Thes con- 

 trivances were before we were aware of it, painted a dark green 

 by the carpenter, but it appears to be no obstacle to their use- 

 fulness. 



