During 1966-1975, 38 species of delphacid planthopper including 1 unidentified species in 26 genera were caught by the standard light trap, 60W bow-frosted bulb with double filament, operated in rice fields at Chikugo, Fukuoka. The average number of individuals of the delphacids per year ranged from 0. 1 to 6, 216 for the various species. Among the species, 92.9 % of the catch was composed of 10 species, including 3 rice planthoppers: Nilaparvata lugens 23.0 % (top), Sogatella furcifera 10.4 %, and Laodelphax striatellus 3.7 %, while in 8 species there were only a few individuals during the 10-year period. Among the species indigenous to wild grasses, Harmalia albicollis ranked first, accounting for 20.3 %, followed by Saccharosydne procerus 10.7 %. In addition, 6 species in 3 genera were recorded only by a sweep net.