Entomology definition of Antenna-cleaner: a fringed excavation on the interior
base of the 1st segment of the anterior tarsi of Hymenoptera
which, when covered by the movable process from the end of the
tibia, forms an opening through which the antennae may be drawn:
similar structures are on the fore tibiae of Carabid beetles:
tarsal claws are also used by various insects to clean
antennae.