There are many types of native Cuckoo Bees, this Cuckoo Bee falls in the same family (Apidae) as Bumble and Honey Bees.
As the common name suggests, like Cuckoo Birds, Cuckoo Bees lay their eggs in the nests of other bees. In our region, the Cowbird would be a good comparison.
Why go to all the work of collecting pollen and nectar to provision a nest when another bee can do it for you?
As the Nomada larva develop, it consumes the host bee bread (a combination of pollen and nectar).
Pictured visiting the flowers of Wafer Ash (top), American Bladdernut (middle), and Wild Geranium (left).
I have Mining Bees (Andrena spp.) nesting in the sandy soil of the south slope in our yard. In early spring, several of these Cuckoo Bees will be flying low to the ground landing on sticks and leaf litter seeking out the nests of the Mining Bees.
Source: Attracting Native Pollinators: The Xerces Society Guide, Protecting North America's Bees and Butterflies