Excavator: Ground. A gregarious species, nesting in very localised aggregations. Nevinson (1904) encountered males near burrows in the joints of a stone wall, but nesting burrows are more usually excavated in the soil.
The following details are adapted from Packer (1983), who studied the species in some detail on the Charmouth-Lyme Regis landslip, Dorset. He found an aggregation nesting in a 30° slope and occupying an area of about 15 square metres. The burrows were begun in dessication cracks in the clay soil, the excavated spoil being packed into these surface fissures and not forming conical tumuli surrounding the nest entrances (as in many other Lasioglossum species). As a result, nesting aggregations are difficult to locate. Spring and summer broods are reared in cells which are constructed in comb-like clusters, each of these surrounded by a cavity which is enlarged as the number of cells increases; nest development is figured by Packer. The gynes do not seem to overwinter in their natal nests. This is a eusocial species, workers being on average about 7% smaller than the gynes. There is a high proportion of males (24%) in the first brood and pupal counts from excavated cells indicated a ratio of 3:1 males to females.