A medium-sized black wasp, approximately 1/2 inch (13 mm) long, with yellow bands on the abdomen, a yellow collar on the thorax right behind the head and a semi-elliptical yellow mark on top of the thorax. The legs have black femurs and yellow tibia and tarsi. Wings are smoky brown.
This mason wasp is common in this area. It ranges from coast to coast in North America and into northern Mexico. There are 24 described species and 2 undescribed species in North America in the the genus Euodynerus.
This wasp nests in borings in wood, hollow twigs, corrugated cardboard and other suitable cavities like old paper wasp nests. It uses mud or firmly agglutinated sand for cell partitions and closing plugs. Prey are caterpillars of many families of moths.
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