Lepidoptera
This order of insects includes the butterflies and moths alone. It is well characterised by the four large membranous wings, covered with small scales, and by the entirely suctorial mouth; in the latter, the jaws are adapted to form a long tube, which, when not in use, is spirally coiled away below the head. The larvae are known as caterpillars, and possess six true legs on the front segments, besides a variable number of prolegs or fleshy legs behind. They feed almost always on plants, and are often very destructive (see Hawthorn Caterpillars, Hybernia, &c.). The pupae are almost motionless, and are often inclosed in a cocoon of silk, earth, or other material. The limbs in the pupae are closely bound down to the body (obtected). The Lepidoptera are divided into two great groups; Diurni, or butterflies, with antennae usually clubbed at the tip; wings usually erect in repose, not connected by a spine and hook; pupae usually naked and often angular; almost all are day fliers. Nocturni, or moths, with antennae pointed at tip; wings connected by a spine and hook, usually horizontal in repose; pupae more rounded than pupae of the Diurni, almost always in a cocoon; mostly nocturnal in their habits. The larvae of this group are more frequently injurious than those of the Diurni.