Make a Light Trap
A simple light trap can be made from a funnel, a round gallon can and a light. You can buy a large funnel or make one by cutting the bottom out of a gallon milk or detergent container. Place the funnel on the can as shown in the illustration, and suspend the light slightly above the funnel. Insects that fly into the light bulb fall down the funnel and are trapped in the can. The spout of the funnel should be large enough to let the insects drop through it easily, but not so large as to let the insects fly out again. A few strips of one inch wide newspaper in the can will give insects a place to hide so they are less likely to try to escape. When getting the insects out of the trap, put the can and funnel together into your collection net before removing the funnel. This will prevent active insects from escaping.