April, '04] 



ENTOMOLOGICAL NEWS. 



133 



lyn Entomological 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 



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 



