Strongylognathus testaceus is a very rare ant parasitic on Tetramorium caespitum (Linnaeus). It is thought to be a degenerate slave-maker. Workers are yellowish brown, have pronounced occipital emargination and toothless sickle shaped mandibles.
Very local in Devon, Dorset, and S. Hants.
In Europe present from the Pyrenees to Western Siberia and Sweden to North Italy.