Cleptoparasitic: Hosts; This species is unusual among British Nomada in being cleptoparasitic only on small Lasioglossum species. R.C.L. Perkins (1918f) found many fully developed adults of this Nomada in the burrows of a mixed aggregation of L. parvulum and the closely related L. nitidiusculum. Both species are quoted as hosts in his 1923 paper. Some years later he again found it flying with L. parvulum (R.C.L. Perkins, 1945). G.M. Spooner (pers. comm.) has similarly observed it with the latter species. The Nomada has also been reported associating with, or actually at, the nesting burrows of L. nitidiusculum (Hallett, 1928; Spooner, 1931; Chambers, 1949). L. morio may be a host (F. Smith, 1876 and G.M. Spooner, pers. comm.). Spooner also observed this Nomada with L. villosulum on the Dorset coast. Finally, L. smeathmanellum is stated to be a host by V.R. Perkins (in Witchell & Strugnell, 1892).
In Germany, Haesler (1982) cites L. sexstrigatum as a host (Westrich, 1989). British records summarised in Edwards & Else, 2018; Continental records in Smit, 2018)