328 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 6 



diameter. It will be noted that a similar cone is placed in position 

 within the larger one, the diameter of the small hole in the inner cone 

 being the same as the smaller opening of the large cone. Both of these 

 openings should be large enough for roaches to pass through easily. 

 One side of the inner cone is glued to the outer cone. 



In setting a trap a little banana is smeared around the inside of the 

 cone as an additional attraction to the insects. A number of human 

 hairs were glued, in some of our trials, to the inner cone at the smaller 

 end (see illustration), but repeated trials indicate that these are unnec- 

 essary and add to the complexity of the otherwise simple trap. 



The following baits were tried: 



1. Milk — this worked very well in the dairy building, but gave poor 

 results in other buildings. 



2. Liquid chocolate gave poor results. 



3. Banana peel; by far the most attractive, giving the best results 

 of anv baits tried. 



^a/y~6 On /nnef CO)i€ 



Outer paper Corye. 



Fig. 4. Graham roach trap (original) . 



We took occasion to compare this simple trap, which we propose to 

 call the "Graham Cockroach Trap" with the Hodge Fly Trap, which 

 frequently catches roaches. The Graham Trap is superior to this for 

 many reasons. 



In the first place the Hodge Fly Trap has the bait outside of the 

 actual trap, that is in the bait pan below the cone and its opening, so 

 that a roach might crawl back (not seeking the light above as flies do) 

 outside of the pan and make its escape; whereas, in a Graham Trap the 

 bait is inside and the roach has to enter the trap before feeding. It is 

 somewhat difficult for roaches to escape from the Graham Trap when 

 once inside, which is clearly evident from observing its construction. 



