Vespula
Vespula is a small genus of social wasps, widely distributed in the Northern Hemisphere. Along with members of their sister genus "Dolichovespula", they are collectively known by the common name yellowjackets (or yellow jackets) in North America. "Vespula" species have a shorter oculomalar space (shown in the figure below right) and a more pronounced tendency to nest underground than "Dolichovespula". See also: Venom. Mostly composed of antigen 5, hyaluronidase, and phospholipase. Immunology. There is a high degree of similarity between immunogenic fractions of different "Vespula"e. Rabbit serum is unable to distinguish between them.