PRIOR to the War, Imperial Entomological Conferences Were held in London at five-yearly intervals, but because of the War it is now thirteen years since the last one assembled. The Fifth Commonwealth Entomological Conference, to be held in London during July 22–30, will be attended by forty-two delegates, eleven representing the United Kingdom, nine the Dominions and twenty-two the Colonies, Protectorates, Dependencies and Southern Rhodesia. All meetings, with the exception of certain business meetings to be held on July 22 and 30, will be open to the public. The Conference has been convened by the Executive Council of the Commonwealth Agricultural Bureaux and organised by the Commonwealth Institute of Entomology, which is one of the constituent bodies of the former organisation. With the exception of one meeting to discuss plant quarantine, all other topics selected for discussion have been chosen because they relate to some branch of applied entomology in which outstanding developments have occurred since the last Conference Which met in 1935 ; they include insecticides, biological control, estimation of insect populations in the field, control of insects in stored products, tsetse control, locusts and grasshoppers. Further particulars can be obtained from the director of the Commonwealth Institute of Entomology, British Museum (Natural History), Cromwell Road, London, S.W.7.