This is one of the few Nomada Cuckoo Bees that is relatively easy to identify. The name referrers to a missing vein in the wing that makes this species unique in having only two submarginal cells. It is known to parasitize the Red-tailed Mining Bee, which is a Willow specialist.

Unless otherwise specified, photos are courtesy of Margarita Miklasevskaja at PCYU with funding from NSERC-CANPOLIN.