NO. I J 



SENSE ORGANS OF COLEOPTERA McINDOO 



23 



5a it Container 

 --Jar 



Fig. 4. — Japanese beetle trap, used by the Federal Plant Quarantine and Con- 

 trol Administration, showing parts of it in a cut-out perspective view. It is one- 

 fourth natural size and was drawn by the writer by using a 1929 trap and a 

 drawing of a 1930 trap, the latter being furnished by Mr. Courtney. The beetles, 

 attracted by the odor from the l^ait in the bait container, fly directly into the 

 funnel or strike the baffle and then fall down through the funnel into the fruit 

 jar, where they cannot escape because they can neither fly out nor climb the 

 walls of the jar. 



