One hundred and eight species of macrohymenopterans belonging to
fifteen families and fifty six genera were recorded from the Silent Valley
National Park. The families Sphecidae, Formicidae, Pompilidae and Apidae
contained maximum number of species. The insects were collected from five
habitats, viz., tropical evergreen forest, subtropical broad leaved hill forest,
montane wet temperate forest, low altitude grasslands and high altitude
grasslands. Of the various species recorded in this study, seven genera and
eleven species are new reportsfor Kerala and seven species are new reportsfor
India