Pterothorax: the wing-hearing thoracic segments in Thysanoptera.
Pterygium: a lateral expansion of the snout of some Coleoptera.
Pterygodes: the patagia or tegtila: q.v.
Pterygogenea: insects that are winged in the adult stage or believed to be descended from winged ancestors: see apterogogenea.
Pterygostium: a wing vein.
Pterygote: wing bearing.
Ptilinum: in Diptera cyclorrhapha, an inflatable organ capable of being thrust out through a frontal suture just above the root of antenna.
Ptilota: winged insects.
Pubes or Pubescence: short, fine, soft, erect hair or down.
Pubescent: downy: clothed with soft, short, fine, closely set hair.