Cleptoparasitic: Hosts; Andrena hattorfiana (e.g. Bridgman, 1879; Hamm, 1901; R.C.L. Perkins, 1919g). Females of N. armata have been observed flying over the nest burrows of A. hattorfiana on Salisbury Plain, Wiltshire (Else & Roberts, 1994).
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