two Vespa crabro flavofasciata(s)(up left) and a Vespa mandarinia japonica(below).
Vespa crabro flavofasciata.
-worker 21-28mm. (info from japanese wiki)
-queen 28-30mm. (info from japanese wiki)
japanese name: モンスズメバチ.
http://www.vespa-crabro.com/hornet_vespa_crabro_flavofasciata.htm