Univoltine, but with an extended flight period. Females from late April to the end of October, males from mid August to the beginning of October.
Label data from a few Spanish specimens shows that females are active in July and August in the Picos de Europa and the Sierra Nevada, Spain (Ortiz-Sanchez & Pauly, 2017).
Parasites and predators Sphecodes geoffrellus [as S. affinis] females have been seen investigating probable nest burrows of this species in Ireland (Stelfox, 1927).
Systematics This species has long been known as a native of the British Isles, but until 1970 it had been variously referred to in the British literature as an undescribed species allied to
Lasioglossum smeathmanellum or a northern race of it. The British and Irish populations of this species differ from one another in certain minor morphological respects. In 1970 Ebmer described each of these taxa as new species: Lasioglossum scoticum and L. hibernicum respectively. Later (1976), he considered that both names were conspecific with L. cupromicans (Pérez).
Both L. cupromicans and L. smeathmanellum are so closely related that some females and undissected males can be difficult to identify. Thus, all published British records of both species
(especially within south-central and south-east England), which are not supported by voucher specimens, should be regarded as doubtful.