Nomia

Nomia is a genus of sweat bees in the family Halictidae. Many species have opalescent bands on the metasoma. Nomia species are moderate-sized bees that nest in the ground. Most species nest solitarily, but some species also nest communally where females share a nest but where there are no queen or worker castes. Nomia species are found Africa, tropical Asia, Australia, and in North America. There are about 130 species world wide.

Nomia melanderi is an important pollinator of alfalfa. They prefer to nest in salty soils. The Walla Walla Valley farmers in Washington State not only sell alfalfa, but some farmers also raise and sell this species of bee.