Plexus: a knot: applied to a knot-like mass of nerves, or tracheae. Plica: a fold or wrinkle: a longitudinal plait of a wing. Plicate: plaited; folded like a fan. Plications: folding,; applied to the folds on the hind wings of Orthoptera. Plicipenna: = Trichoptera; proposed by Latreille. Plumate: like a feather. Plumbeus: leaden or bluish gray [neutral]. Plumose: feathered; like a plume: antennae that have long ciliated processes on each side of each joint: see cirrate. Plump: with full, rounded outlines; not obese. Plumules: specialized scales of the androconia of male Lepidoptera. Pluri: as a prefix, means many. Pluri-dentate: with many teeth. Pluri-setose: bearing several seta; as the head in some Carabids. Pluri-valve: with several valves or valve-like appendages. Pneumogastric: the ganglion supplying nerves for the tracheal and digestive system: also used as = vagus: q.v. Pneustocera: breathing horns: the prolongations of the metathoracic spiracles in Berytidae, etc. Pnystega: in Odonata, applied by Charpentier to a portion of mesonotum. Pobrachial: a longitudinal vein of the Ephemerid wing just behind praebrachial; usually simple: number 7 of some systems. Podeon: in Hymenoptera, the petiole: the true second abdominal segment. Podex: the upper plate of the anal opening; = supra-anal or sur-anal plate in caterpillars. Podical plates: the latero-ventral plates attached to the loth abdominal segment of Orthoptera; the two pieces on each side of the vent, thought by Huxley to be rudiments of an 11th abdominal ring; united they form the tergite of a rudimentary ring: = anal valves: paranal lobes. Pododunera: apterous insects with biting mouth structures. Podotheca: that part of pupa that covers the legs of future adult. Poecilocyttares: social wasps that build their combs around the branch or other support covered by the envelope: see stelocyttares and phragmocyttares. Poisers: = halteres and balancers; q.v. Poison glands: sometimes applied to the salivary glands of bugs and biting flies; more usually to an abdominal gland connected with the sting of female Hymenoptera. Policate: a tibia produced inwardly into a short, bent spine or thumb. Politus: smooth, shiny, polished. Pollen: a dusty or pruinose surface covering which is easily rubbed off; used mostly in Diptera. Pollen-plate: a polished area margined by hair, on the outer face of the tibia in bees. Pollex: a thumb: the stout fixed spur at inside of tip of tibia. Pollicatus: = policate; q.v. Polliniferous: formed for collecting pollen: pollen bearing. Pollinigerous: = polliniferous: q.v. Pollinose: covered with a yellow, pollen-like dust. Poly-: many, much. Polyandry: where a female mates with more than one male. Polychromatic: many colored. Polydomous: applied to ants when one colony has several nests. Polyembryony: the production of several embryos from a single egg, as in some Chalcids. Polygamy: where a male mates with more than one female.