Two previous lists of Parasitic Hymenoptera of economic importance have been prepared and published by the writer—one in 1919 and another in 1921 ; these included some of the more important of the economic forms then noted. During the last two or three years further work in this line was continued and additional data have been collected. In this paper an attempt is made to bring together in one incorporated list all the forms hitherto recorded from South India, at the same time revising the previous lists wherever necessary and adding recently collected data or data omitted from the two previous lists. It is believed that this revised list, with the available bionomical and synonymical notes, may be of some use for purposes of reference to those interested in this line of work. The writer takes this opportunity of expressing his thanks to the authorities of the Imperial Bureau of Entomology, London, and of the United States National Museum, Washington, for the help received from them in identifying some of the forms submitted to them, and confirming or correcting some of the identifications made at Coimbatore.