Abstract
The geographic range analysis of 59 species of the family Vespidae (Hymenoptera) of northern Mongolia was performed using published sources and our own data. The longitude-latitudinal approach is supported for the chorological division. Chorological component of vespid fauna of northern Mongolia is mainly composed of Palaearctic polyzonal and sub-boreal species associated especially with sub-boreal semi-humid and sub-boreal semi-arid landscapes. Northern Mongolia together with Trans-Baikal region act as barrier to the latitudinal and longitudinal distribution of vespid wasps, and it can be called, as the Baikal-Mongolian faunal barrier. Four sub-endemic vespid species, Onychopterocheilus turovi (Kostylev, 1937), O. kiritshenkoi (Kostylev, 1940), Ancistrocerus rufopictus (Kostylev, 1940), Eumenes transbaicalicus Kurzenko, 1984 were defined to Mongolia.
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