AbstractA tube having an open front end and a piston therein. The piston is moved manually to a forward cocked position adjacent the open end of the tube, against the action of a tension spring. A closure flapper is hinged in the tube adjacent the open end of the tube, spring biased to closed position. In operation, the open end of the tube is held near the insect, with the piston in cocked position, and the piston is then released, which is thereupon drawn back by the tension springs. This movement of the piston produces a vacuum in the tube, this action opening the closure flapper, and drawing in the insect, after which the closure flapper is moved to closed position by the spring.