The results were shown as follow: 1) In four different arenas (i.e. Petri dish, glass vessel, glass vessel with barriers in it, and cage with potted cotton plant), the predaceous efficiency of C.

• 结果表明:1)在两处地点的4种试验容器即培养皿、养虫器、内置障碍物的养虫器和内置盆栽棉花的笼罩中,草蛉幼虫的捕食效率因猎物的密度而变化。