Both Nomada fulvicornis and N. marshamella (Kirby) greatly resemble one another in the field, particularly males. However, the females of N. fulvicornis generally have obvious reddish markings on the more basal sternites and similar ones are often (though much reduced) present on some of the tergites. In the males there are no inner orbital yellow or orange bands in N. marshamella; these are present in N. fulvicornis but are frequently reduced to a few small spots. N. fulvicornis has two distinct subspecies in Britain, these expressing themselves in subtle colour differences, tergite and sternite markings and the overall size of both sexes. That associated with Andrena nigrospina is referable to subspecies subcornuta (Kirby), whilst populations attacking the nests of closely related Andrena species (see below) are subspecies fulvicornis Fabricius. These subspecies are described and discussed in some detail by Falk (2005).