Image Gallery from Gembloux (页面存档备份,存于互联网档案馆) Vespidae: Potter wasps; Vespid wasps; Social wasps; Hornets; Paper wasps; Yellowjackets (页面存档备份,存于互联网档案馆)
Rojas & J.G Baust. Caste and sex differencesin cold-hardiness in the social wasps, Polistes annularis and P. exclamans. Insectes Sociaux. 1984, 31 (3):