Adult Toxorhynchites rutilus septentrionalis mosquitoes, which are non-bloodsucking, were induced to take blood, and the destination of blood or sugar solution along the alimentary canal of the mosquitoes was studied with or without a 24-hr starvation period prior to the experiments. The effects of removal of the labella, and the presence or absence of the cibarial ventral papillae on distribution pattern of food, were also studied. Unlike most blood-sucking Dipterans the blood meal did not go to the midgut alone but to the midgut and crop or, in a few males and females, to the crop alone. The sugar meal frequently went only to the crop, as in most blood-sucking Diptera, but it also went to the crop and midgut. The removal of labellar lobes had no effect on the distribution of the blood meal in either sex of starved and nonstarved mosquitoes. Almost one third of unstarved females stored blood in the crop alone and two thirds in both crop and midgut whereas all starved females stored blood in both places. With no starvation period removal of the labella affected the distribution of sugar solution only in the females. Furthermore, 24-hr starvation period affected the distribution of sugar solution in both sexes of mosquitoes. The presence or absence of cibarial ventral papillae had no effect on the distribution of blood or sugar meals in either sex. The results are discussed in relation to other bloodsucking insects.