HOUSEHOLD AND CAMP INSECTS 



17 



enter the trap either through a long slit or a small circular hole, 

 depending upon whether the trap is box-like or cylindrical. The 

 larger barn traps may have a length of 2 feet, a height of a foot or 

 so, and a width of about 8 inches. The baseboard carries the bait 

 to which the flies gain ready access and is covered by slanting wire 

 walls, so that the flies, when through feeding, pass up into the 

 screen-covered body of the trap. Provision should be made for 

 the ready removal and destruction of the insects. Small wire traps, 



Fig. 2 Sectional diagram of Min- 

 nesota fly trap. (Author's illustra- 

 tion) 









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Fig. 3 Sectional diagram 

 of the Hodge barn trap. 

 The dotted lines show the 

 approximate position of the 

 wire screen. (Author's 

 illustration) 



suitable for dwellings, are readily available, and it is comparatively 

 easy to make larger ones from materials at hand. Barrel hoops 

 supported by perpendicular strips form a very convenient frame- 

 work for a cylinder of wire within which may be fitted the cone, 

 and below which should be attached a feeding board. It is then 

 necessary only to provide for the easy destruction and removal of 

 the captured insects. 



A modified box trap can be inserted in the wall of a manure pit, 

 thus capturing all flies which try to escape, or it may be double, 

 adjusted to a suitable window, and arranged so as to catch flies both 

 as they attempt to enter and leave. This last was devised by 

 Professor Hodge. 



