Genus Archaulacus gen. nov.

Type species. Archaulacus probus sp. nov.

Etymology. From the Greek arch-, meaning “ancient”, and generic name Aulacus .

Diagnosis. Head transversely board. Antenna consisting of more than 20 antennomeres. Fore wing with Rs originating far from pterostigma, pterostigma narrow, long, parallel-sided; first abscissa of Rs subvertical to R; 2rrs meeting Rs quite basad of 2r-m and slightly longer than the maximal width of 2rm; 2m-cu slightly basad of 2r-m, 2rm slightly longer and narrower than 3rm; 2rm in contact with 1mcu by a point; cu-a postfurcal. Hind wing with C present. Metasomal long-ovoid with first metasomal segment nearly triangular, ovipositor longer than fore wing.

Remarks. We assigned Archaulacus to Praeaulacidae by the following diagnosis: long, polymerous antennae with smooth contours; fore wing with M+Cu forking much close to pterostigma than to wing base, 1r-rs absent, 2rm, 3r-m and 2m-cu present, 2A absent; ovipositor long with sheaths more than half length of metasoma. However, the new genus differs from other praeaulacines in fore wing with first abscissa of Rs subvertical to R; 2r-rs meeting Rs quite basad of 2r-m and slightly longer than the maximal width of 2rm; 2m-cu slightly basad of 2r-m.

Species included. Archaulacus probus sp. nov.