Social companionship and division of labor become “obligatory” and, although a mated queen can build a nest independently and raise the primary worker bees herself, she wants the assistance of employees to help rear sexually mature bees. Similar preliminary stages to a social group are found in the Vespidae. The female Stenogaster depressigaster passes a number of generations in the communal nest, and the daughters construct their very own cells and care for their very own offspring. In the case of Belenogaster, however, whose nests embody about 60 cells, the females not only feed their very own brood but additionally indiscriminately feed all larvae current. Trophallaxis, or change of meals between staff and larvae, is an extra improvement. The primary evolutionary step towards a division of labor occurs in Polybia. Some female Polybia only lay eggs. In others, known as assisting females, the gonads are poorly developed