April, '04] 



ENTOMOLOGICAL NEWS. 



133 



lyii Eutomological Society (1883), and a cross-section is shown 

 at Fig. 14, and an outside view at Fig. 15. The dimensions 

 are about forty inches long, of which ten inches are the lamp 



^O- 



compartment : the wide 

 flaring mouth or open 

 end is about eighteen 

 inches square; the width 

 at the other end tapers 

 to nine inches ; and on 

 the back of the lamp 

 compartment is a hinged 

 door. The whole frame 

 of the trap is made of 

 one inch thick poplar, 

 except the top of the lamp space, which is better of tin to 

 avoid danger of fire. A hole on top, with a bottomless tomato 

 can for a chimney, will prevent the wind from blowing out the 

 lamp. The oblique lines in the sectional view are sheets of 

 glass, the outer and in- 

 ner beginning at the bot- 

 t o m and reaching t o 

 within one inch of the 

 top, the middle sheet 

 starting at the top but 

 not reaching the bottom 

 by one inch. Of course, 

 a fourth pane of glass 

 separates the lamp from 

 the trap proper. On the 

 floor of the inner compartment, just in front of the lamp space, 

 is a circular hole for the insertion of the cyanide jar. 



This should be a one- or two-quart Mason fruit jar with 

 screw-top. The most convenient way to use the jar is to have 

 two screw-caps, one of which has the entire top cut out, leav- 

 ing only the screw-ring ; this ring .should be permanently fast- 

 ened in the hole made for it in the bottom of the trap ; a good 

 joint can be made by tacking a lid of a cigar-box on one .side 

 of the hole ; then lay the ring (with big end down) on the 



