One of three small metallic species of Lasioglossum in Ireland, along with L. cupromicans and L. leucopus. Females measure around 6-7mm in length and males are around 5mm and more slender in shape. The Irish specimens seem to be less metallic and duller on the abdomen compared to British examples. The punctures on the female thorax are sparser and more uneven than L. leucopus, but not as much as L. cupromicans, whilst the male has a yellow marked clypeus. In general, it cannot be confidently identified without examination under a microscope. A lack of recent records mean it is classed as Data Deficient.

Distribution in Ireland: Scattered in the southern half of the island, with the greatest concentration of records in Dublin, Wicklow and the Burren in Co. Clare.

Flight period: Early April – September, with males appearing in July and the greatest concentration of records between June and August.

Habitat: Requirements are poorly known, but has been found in limestone pavement, calcareous grassland, coastal cliffs and agricultural land. It appears to be a species of dry, flower-rich areas.

Flowers visited: Various, including Ox-eye Daisy, Bloody Cranesbill, brambles and various hawkweeds, among others.

Personal records: I have recorded this species on several occasions in the Burren, Co. Clare at Gortlecka, Bunakippaun Wood and Lough Bunny.  It can be locally abundant and it seems to be common across this region. It nests in loose aggregation in dry calcareous soil, often alongside other species. Unlike other Lasioglossum species, it does not appear to be used as a host by any Sphecodes bees.