Eye-frequenting noctuids have been known from Africa since 1915 and from Southeast Asia since 1958. Their hosts are wild and domesticated members of the mammalian orders Artiodactyla, Perissodactyla and Proboscidea and include cattle, water buffalo, sheep, sambar, antelope, pigs, horses, multes, and elephants. Previous work in northern Thailand has shown that the Noctuidae, Pyralidae and Geometridae include species that quite regularly feed on lachrymal secretions, pus and blood of some of the above-mentioned mammals. Recent observations made in Thailand have revealed that they also frequent the eyes of human beings where they often feed on lachrymal secretions, other ocular discharges and possibly blood. The findings recorded in this paper are based on observations made in northern Thailand under outdoor and indoor experimental conditions. Of the 20 known species of eye-frequenting moths which regularly trouble mammals in Thailand, 6 were recorded on human beings. The photographs are the first taken which show these moths on man. In addition, records from Ceylon, southern India and Burma are included, together with some of the more striking cases observed of eye-frequenting moths troubling human beings. The Lepidoptera concerned have long been suspected of being the vectors of bovine diseases; in view of these new findings it is evident that these moths will have to be considered as potential vectors of the trachoma virus and of other causal agents of eye diseases, for example keratoconjunctivitis, ophthalmia, "pink-eye,” in human being
