_Ovisac._ The cottony bag or nest formed by certain species of _Lecanidinæ_ and _Coccidinæ_ for the reception of their eggs. (Plate xii., Fig. 1, _a_, _b_, _c_; Plate xix., _a_, _b_, _c_.) _Peduncle_, _pedunculated_. A stalk; stalked. _Pellicle._ The skin of an earlier stage, cast off at each metamorphosis; used by the _Diaspidinæ_ and by one genus of _Lecanidinæ_ in the formation of the puparium or test. (Plate i., Fig. 3, _a_, _b_; Plate vii., Fig. 2, _b_.) _Polymerous._ Many-jointed. _Pupa._ The last stage of the male insect before emerging winged. _Puparium._ The shield, covering, or "scale" of the _Diaspidinæ_. (Plate i., Fig. 3, e; Plates iv., v., vi.) _Rostral setæ._ Three or, in a few cases, four long, fine, curling, tubular bristles springing from the rostrum, and often passing through a mentum; used for insertion into the tissues of a plant and sucking their contents. (Plate i., Fig. 5; Plate vi., only one being here shown, from the smallness of the drawings.) _Rostrum._ A more or less conical, tubular, projecting organ, or beak, protruding from the under-side of the cephalic region, or between the first pair of feet. It is absent in the adult female _Cœlostoma_. It is the "mouth" of the insect. (Plate i., Fig. 5; Plate iv., Fig. 5.) _Sac._ The cottony, bag-like covering or nest produced by the spinnerets and concealing the insect in many of the _Coccidinæ_ and some _Lecanidinæ_. (Plate xv., Fig. 1, _c_; Fig. 2, _b_.) _Scale._ The shield or puparium of the _Diaspidinæ_. The word is commonly used to designate the outward appearance of insects of the whole family, which are indiscriminately called "scale-insects," although many of them form no shield whatever. _Secretion_ may be of various kinds. It is matter produced by internal organs, and expelled through the "spinnerets." In the _Diaspidinæ_ the secreted portion of the puparium (that is, all except the pellicles) is made up of fine, closely-woven fibres, forming the "scale." In the _Lecanidinæ_ it probably exudes originally as fine fibres, but these become agglomerated in some cases in a waxy or horny mass, or in others are loosely collected as cotton. In the _Coccidinæ_ the secretion is usually cottony, or powdery like meal. _Cœlostoma_ secretes all three--wax, cotton, and meal. In some instances, as in _Carteria lacca_, of Africa, the wax, called "shellac," is abundant enough to be commercially valuable; or, as in the Chinese _Ericerus Pe-la_ it can be used for making candles. _Seta._ A bristle--a long stiff hair. _Setose._ Bearing a few bristles.