288 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 4 



piece is run to meet with that piece and around them 1-4 inch wire 

 screen is fastened. We now have a tray that will hold about two 

 sacks of leaves and with a sifting surface ecjual to nearly ten square 

 feet. 



The other two trays are made to run parallel with each other and 

 slanting as much as possible in the remaining upright space. This 

 should be from one inch from the top tray to within one inch of the 

 water tank. These trays rest on a board which runs across the end 

 of the box E and are supported at the other end by hooks which gives 

 them a free movement for jarring. This cross board also acts as a 

 base for them to fall upon when they are dropped by the turning of 

 the jarring wheel. 



Tray 2, as shown in the diagram, is made with two pieces of 1-8 

 inch wire screen. One piece running from the top of the upper edge 

 to within 8 inches of the lower side at the bottom. The second piece 

 runs from the top of the lower side to within an inch of the other 

 piece and so leaves an open space of one inch running transversely 

 across the box. A small tray of tin is fastened across this opening, 

 the sides being rounded as shown in the illustration. The ends are 

 of tin and are soldered so that the insects cannot escape, most forms 

 being unable to crawl up the tin surface. This tray is fastened in 

 place by reversible clamps and can be removed by lifting up the tray. 

 The insects thus caught can be transferred to something else and 

 the tray returned to its place with but little loss of time. 

 . Tray 3 is made so that the carrying part is of tin, one inch deep, 

 open at the lower end and overlapping a cross tray. The tin part 

 is placed so that it is about even with the top of the carrying frame 

 and reaches to within two inches of its lower end. At the bottom of 

 the main tray a shelf is placed to hold a cross tray three inches wide 

 which underlaps the main tin tray and catches all that falls into it. 

 This tray is made to fit squarely into the wooden tray and can be 

 removed by raising up the middle tray. 



The lower cross tray will necessarily catch all the rubbish and 

 small particles of sand that fall through the upper trays but the 

 author was able to separate out the insects by gently pouring the 

 contents of the tray into a tub of water. The sand and dirt would 

 sink to the bottom while the insects would be held on the top film of 

 water. To what extent this would apply it is hard to say as mites 

 only were considered in our experience. 



