Abstract: Small lumps of foamed plastic may be used as a shelter for rearing or transporting entomophagous insects. Also disclosed is a container for keeping entomophagous insects, which comprises a hollow body containing small lumps of foamed plastic and provided with one or more holes on its upper surface, the holes being of a size such that the entomophagous insects can pass through them but the small lumps of foamed plastic can not pass through them. This arrangement prevents the entomophagous insects from preying on each other, making it possible to efficiently rear or transport the entomophagous insects, particularly predatory insects such as lacewings, lady beetles and predatory bugs, for use in controlling insects that are harmful to field crops.