402 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 14 



composed of those which were thrown back in this manner. Care was 

 taken that none of the apparatus touched the plants ahead of the pan, 

 otherwise many beetles would be disturbed too soon, and escape before 

 the pan reached them. A few leaves and blossoms were also caught in 

 the oil, but the amount was negligible. The above outfit gave a catch 

 of over 2000 per acre, but, as m.any of the beetles escaped by flying away, 

 a wire screen hood was added, which resulted in raising the catch to 3500 

 beetles per acre.^ 



The hood was made of a 3-foot wire screen, 15 feet long, which was tack- 

 ed to the fram.ework at the back of the pan, with the edge of the screen 

 extending down inside the pan, and curved upward and forward to 

 about a foot and a half above the pan (Figure 8) . The advantage of the 

 screen hood over the canvas is the same as that of a screen fly-spatter 

 over a solid one, i.e., it permits the passage through of air when in motion. 



iSectiortal canvas 

 corf at n 



'^ectiona? canoes curtain 

 ' — Runner 



U 



re screen 



hood\ 



-\ \ \A 







Oil pan' 



Fig. 8 



Fig. 8. Mechanical Devices for Capturing Cucumber Beetles: Lower, adapted for crops grown in 

 rows; Upper, for crops grown in hills. (Oiiginal) 



^Also 350 tarnished plant bugs. 



