Polistinae

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Polistinae

Scientific classification

Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Suborder:	Apocrita
Superfamily:	Vespoidea
Family:	Vespidae
Subfamily:	Polistinae

Tribes

Polistini
Epiponini
Ropalidiini

The Polistinae are eusocial wasps closely related to the more familiar yellowjackets, but placed in their own subfamily, containing three tribes; it is the second most diverse subfamily within Vespidae, and while most species are tropical or subtropical, they include some of the most frequently-encountered large wasps in temperate regions. They are also known as paper wasps, which is a misleading term since other wasps (including yellowjackets) also build nests out of paper, and because some Epiponine wasps (e.g., Polybia emaciata) build theirs out of mud [1], nonetheless, the name paper wasp seems to apply mostly, but not exclusively, to the Polistinae, especially the Polistini. The brood cells are arranged in a hexagonal aray, similar to the comb structure in a honey bee nest. At least one Epiponine species (Brachygastra mellifica) stores honey in the comb, one of the only insects other than bees to store honey.

Ropalidia marginata

Characteristics of Polistinae are:

queens (reproductive females) morphologically similar to workers, though sometimes slightly larger or differently colored
the abdomen is spindle-shaped, often petiolate
the antennae of males are curled
the nest is sometimes open (the nests of vespines are typically enclosed in several layers of paper)

[edit] Colony life cycle

Polistine wasps found colonies in one of two ways. In some species, nests are founded by a small number of reproductive females, possibly a single one. One of the foundresses eventually acquires dominance over the other and is the sole reproducer. The nest is open (not enclosed by an envelope) and contains a single comb.

Nest of a Ropalidia

In the other group, called swarm-founding, the nest is founded by a large number of workers and a few queens. It is usually protected by an envelope, like a vespine nest.