Show kinds of inse insects ets known U S has of species of insects known to scientists of the world are found in the united states says colliers of these more than are neither harmful nor helpful to mankind of the remaining species about are injurious as they carry disease to humans and domestic animals ot 01 destroy crops while the other are beneficial as they prey on destructive insects cause cross pollination of plants or produce useful substances such as dye dyestuffs stuffs lac honey and silk |