Indigenous academic Marcia Langton has again accused a prominent rival of "racism", using an internal university mailing list to sledge a critic of her controversial ABC Boyer Lectures.

Transcripts of an Australian Anthropological Society debate -- obtained by Crikey -- reveal a heated exchange between Langton and her academic peers over an article by Professor Boris Frankel published in the latest Arena Magazine, "Opportunity Lost". It is Langton's third public accusation of racism in the last three months, a serious charge in the modern academy.