Figs 17–20.
Diagnosis. This species differs from closely related L. moravicus (Habermehl, 1923) by strongly defined notaulus and black hind femur and metasoma (Fig. 20).
Description. Body length 6 mm. Antenna with 32 flagellomeres. Scape 0.5 × as long as wide. Head not narrowed behind eyes, matt. Maximum length of temple 1 × transverse eye diameter; minimum length of temple 0.7 × transverse eye diameter. Face almost as wide as longitudinal eye diameter; convex, medially bulging (Fig. 19). Clypeus separated from face by impression; at apex projecting slightly anteriorly; apical margin of clypeus moderately thick. Clypeal foveae large. Malar space as wide as 0.4 of basal mandible width. Occipital carina complete, not interrupted above. Lower mandible tooth longer than upper.
Notaulus strongly impressed. Lower part of mesopleuron with punctures, shagreened, matt (Fig. 17). Claws pecinate at base. Fore wing with areolet petiolate. Radius intercepting stigma at its middle. Second recurrent vein with a single bulla. Nervellus intercepted below middle. Nervulus interstitial. Propodeal carinae partly complete; area superomedia elongate (Fig. 18).
Metasoma matt, with sparse white hairs. First metasomal tergite 0.5 as long as apically wide; with median longitudinal impression; bordered by lateral longitudinal carinae; median longitudinal carinae absent. Male genitalia with parameres slightly surpassing apex of metasoma (Fig. 20).
Color. Body black. Mandibles, orbits, lateral parts of clypeus, tegula, fore and middle legs yellowish (Figs 19, 20). Stigma brownish.
Material: Holotype, male, Russia, Sakhalin Reg., Yuzhno-Kurilsky District, Kunashir isl., Tretiyakovo, 03.vi. 1973, I. Kerzhner (ZIN).
Distribution: Far East of Russia.
Etymology: The species is named in honor of Izyaslav Kerzhner.