April, '04] ENTOMOLOGICAL NEWS. 135 



bottom. The lamp compartment is four inches long. The 

 chimney and top of lamp compartment are made to slide into 

 place, and the same arrangement is provided for the funnel- 

 shaped piece at the bottom, into the small end of which a 

 Mason fruit-jar screw-top, with the centre cut out, is soldered. 



These slots or slides are shown in the sectional drawing by 

 what look like detached pieces, but of course they are soldered 

 or rivetted to the body of the trap. 



The entire back of the trap is a door working in grooves, and 

 can be entirely removed at the top. The hole in the top for 

 the lamp chimney is placed over the front end of the lamp 

 space, so that the lamp can be easily removed by tilting. 

 There are only three sheets of glass, all of them 7^ inches 

 square. The two front ones are arranged as shown, and come 

 to within half an inch of each other in the middle. They, as 

 well as the sheet of glass in front of the lamp, are held by 

 grooves made by turning up the edge of a strip of tin. The 

 The great advantage of this form of trap is that it is easily 

 portable, as the projecting pieces, top and bottom, the glasses 

 and the lamp can all be removed, and the whole apparatus 

 packed in a telescope travelling bag sixteen inches long by 

 eight inches square. One-pint jars are amply large for this 

 trap. It should also be painted white inside and green out- 

 side. Last year the Merricks started one trap about the mid- 

 dle of June and a second one early in August ; this season 

 they have four ready awaiting the first mild night. The great 

 advantage that must not be lost sight of is that they " work 

 while we sleep." 



The large jars for traps should be made with a layer of 

 cyanide lumps as large as a chestnut, about one inch deep on 

 the bottom, over this another inch of damp sawdust, with 

 sufficient plaster-of-paris to hold all in place. 



This will make a very powerful jar, killing almost instantly, 

 but it is also liable to become very wet after having been in 

 use a short time, therefore pieces of blotting paper, cut exactly 

 the diameter of the inside of jar, should be put in from time to 

 time to absorb the excess moisture, and the layer of raw cot- 

 ton on top of the plaster ma}' have to be renewed every t\vo or 

 three days, to prevent soiling the insects. 



