Social Parasitism

Social parasitism in ants is the coexistence of two or more ant species in one nest or colony, whereby the parasitic species lives in obligatory or facultative, permanent or temporary, dependence of one or several host species. Various forms of social parasitism have been distinguished: Xenobiosis (guest ants), temporary parasitism (only during the time of colony foundation), permanent parasitism with slavery (dulosis), permanent parasitism without slavery (inquilinism).

Here is a recent review of social parasitism:

Buschinger, A. (2009): Social parasitism among ants: a review. (Hymenoptera: Formicidae).- Myrmecol. News 12: 219-235. http://www.myrmecologicalnews.org/cms/images/pdf/volume12/mn12_219-235_non-printable.pdf