CONTROL OF THE HOUSE FLY AND RELATED FLIES 157 



Fig. 33. — Use of flytrap in connection witli manure bin. A. Block of wood set in 

 g;round to which lever raising door is hinged. (Bishopp.) From Farmer's Bull., 

 U. S. Dept. Agr., No. 734, fig. 6. 





l-'i.ATE V'i. — Manure spreader (Bishopp.) 



