lestobiosis

lestobiosis (noun; Greek lestes, robber; biosis, manner of life): (Arthropoda: Insecta) In Hymenoptera, a type of symbiosis in which a group of 'thief ants' of small size nest in or near the chambers of termites and larger ants, eating their stored food, larvae, and pupae unnoticed by their benefactors

See also: cleptobiosis.