A systematic survey was undertaken of the fauna of phytophagous gall midges (Diptera: Cecidomyiidae: Cecidomyiinae) in a restricted area around Fårevejle in NW Zealand. Plant species occurring in the area were scrutinized for galling and non-galling gall midges based on knowledge of associated host plants. The study area is a typical eastern Danish landscape, i.e. coastal plain dominated by arable farming and having scattered forests, except three distinguishing features: it has tracts much hillier than average, semi-natural grassland is unusually prevalent and appreciable areas are semi-urban with summer cottages. One such cottage lot with natural vegetation has made up the geographical center of gravity of the investigation. During 114 days, a total of 114 species of gall midges have been found. Of these, 91 species were hitherto unknow to the faunistic district, including seven new to the country and one presumably undescribed species. The species accumulation curve has only begun to level off, so probably more species occur in the area. Among habitat types investigated, old unimproved grasslands turned out to harbour most species of gall midges and, notably, a greater share of nationally rare species. In contrast, more man-influenced habitats, such as oldfields, had a more species-poor fauna.