Leptothorax grouvellei Bondroit is described again for the worker caste, described for the unknown queens and males, using material from Dieulefit (Drôme, France) and compared with L. niger Forel. L. grouvellei is a supramediterranean species, calcicolous and less thermophilous than L. niger. It is monogynic and nests in ground. Laboratory rearing demonstrates the presence of overwintering brood, rapid brood and late eggs. Workers can live at least two years. Swarming takes place early in the morning. © 1983 Masson.