SECTS.) Order X. Embioptera.—Soft-bodied insects with two pairs of elongate, smoky wings of equal size and with degenerate veins. Mouth-parts for biting: tarsi three-jointed, first joint of f ore pair greatly swollen: cerci, short two-jointed. Females almost always wingless. A small group of insects often living gregariously in silken web-like tunnels and inhabiting warm countries. (See