116 THE ENTOMOLOGIST. 



for the lamp. It should be slightly higher than the back, so as 

 to meet the roof which slopes from e to a. Nail a strong bar 

 from E on one side to e on the other. Then slip a piece of glass, 

 which must be as wide as the trap inside, and deep enough to 

 reach from d to j, in between the slips of wood at d. Then slip 

 a piece of glass of the same width, and deep enough to reach 

 from M to K, in at the point m, and a piece of the same width, 

 about 2 in. deep, in at the point l ; plug the slips at l, and across 

 the front from d on one side to d on the other, and m on one side 

 to M on the other, nail strong wooden bars. These bars will 

 firmly fix the glasses from d to j and m to k. 



A drawer should then be made having a zinc bottom, and 

 sides, front and back of wood. The front should be just deep 

 enough to allow the drawer to shut in between m and c ; the sides 

 and back should not be quite as deep as the front. In the centre 

 of the front screw a handle. 



The trap is now ready for the roof. This is simply a sheet 

 of zinc large enough to project over the front, back, and sides, to 

 keep off rain, and should be firmly nailed to the cross bars at a, 

 E, and D, and to the partition at f. If not nailed tight to this 

 partition throughout its entire breadth, there will be chinks 

 through which insects will get into the back of the trap and be 

 injured by the lamp. Before fixing, a hole should be cut in the 

 zinc to admit the chimney ; the hole should be round, and as 

 nearly as possible the exact size of the chimney, to prevent rain 

 from getting in, and should be puttied round when the chimney 

 has been inserted. This is merely a piece of zinc rolled and 

 fastened together by rivets ; it should be just long enough to allow 

 the lamp chimney to be placed up under it, as in fig. 2. It should 

 be put down through the roof, and fastened to it. The diameter 

 of the chimney is 8 in. 



A piece of zinc, as in fig. 4, should then be taken, and a piece 

 of hoop-iron rivetted to each side of it in the centre. It should 

 then be drawn down double (see fig. 5), and the pieces of hoop- 

 iron fixed to the chimney, so that the piece of zinc stands clear 

 of the chimney, forming a sort of shade or cap to it, and the trap 

 is complete. 



As I said before (Entom. 15), and as will be seen from the 

 above sketch (fig. 2), which I have taken the liberty of copying 

 from Entom xxiii., the trap is Mr Christy's trap with very slight 

 additions, the principal being — 



(1.) The drawer. I find this no trouble at all beyond the 

 bruising of the laurel leaves with which it is filled. A piece of 

 muslin is stretched over the leaves to prevent moths falling 

 among them. The reason the sides and back should not be so 

 deep as the front is, that if they were, and the muslin stretched 

 tight over them (which I find is better than letting it rest on the 



