Expansion of entomology services Hewitt was appointed dominion entomologist of Canada in May 1909, the second to hold that post, succeeding
James Fletcher. He travelled to Canada in September of the same year to take up his position, and immediately began an overhaul of the
entomology service in the Department of Agriculture. By 1915, Hewitt had expanded the entomology service from a small division of the experimental-farms branch into its own branch of the Department with four divisions, each headed by an entomologist. These divisions included systemic entomology, field-crop and garden insects, forest insects, and foreign-pest suppression. Hewitt had a talent for attracting the top entomologists of the time, including Reginald Charles Treherne and
Norman Criddle.
Conservation biology Hewitt was also very involved with the parks and forestry branches of the
Department of the Interior, working closely with
James Bernard Harkin on the subjects of bird sanctuaries, game preserves, and the general protection of wildlife. Hewitt was also instrumental in the negotiation of the
Northwest Game Act of 1917, which set regulations for the hunting of birds and animals in the north of Canada. ==Publications and scientific legacy==