The Potter Wasp (Eumenes dubius) is an insect in the Vespidae family of petiolated wasps (with a long thin waist called a petiole). It is a vespid. It is also called a Mason Wasp.

The Potter Wasp is black with yellow markings. The first part of its metasomal section (abdomen section) is narrow and elongated with a bulbous appearance. It has a very thin, long, waist. The thorax is about the same size and shape as the abdomen. Its wings are attached to the thorax. Its six legs are also attached to the thorax. It folds its wings longitudinally when it is resting. It has a large head, large eyes, and a pair of segmented antennae that curl at the tip. 

The female Potter Wasp has a stinger but she is not aggressive. The stinger is also the ovipositor which she uses to lay eggs.