none. In Pamphiliidae and Argidae the metaalinotal plate is clearly divisible into scutellum with distinct posterior lobe and scutum having prominently concave postero-lateral lobes. With all the other characters same, as above, Xyelidae, Cimbicidae, Tenthredinidae and Diprionidae possess inconspicuous posterior lobe of scutellum. In Xiphydridae, Siricidae and Cephidae the postero-lateral lobes of the scutum are very shallow and posterior lobe of scutellum is absent. In Cephidae cenchries are absent. In Ichneumonidae, the reduced scutum is represented only by shallow postero-lateral lobes; in Chalcidoidea the reduced scutum and scutellum are unobtrusively fused. In Chrysididae, Scoliidae, Sphecidae, Vespidae, Eumenidae, Pompillidae, Xylocopidae, winged Formicidae and Mutillidae the metaalinotum is represented by a simple transverse plate. In nonwinged Formicidae and female Mutillidae the metaalinotal plate is unobtrusively fused with the propodeum behind and the mesoalinotum in front.