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Closely related to the andrenas are the nomias or alkali bees.

Nomia melanderi can be found in tremendous numbers in certain parts of the United States west of the Great Plains, for example, in Utah and central Washington.

In the United States Department of Agriculture's Yearbook Of Agriculture, 1952, which is devoted entirely to insects, George E. Bohart mentions a site in Utah which was estimated to contain 200,000 nesting females.

Often the burrows are only an inch or two apart, and the bee cities cover several acres.

The life history of the alkali bee is similar to that of Andrena, but the first activity of the adults does not take place until summer, and the individuals hibernate in the prepupal stage.

In most places, there are two generations a year, a second brood of adults appearing late in the summer.