NEWFOUNDLAND: Little Grand Lake, 2 km east of Martin Pond, 24.VI-15. VII.1992 and 15.VII-25.VIII.1992, old fir forest, pitfall trap, (3, MUN); Little Grand Lake, Bakeapple Brook, 24.VI-15.VII.1992 and 15.VII-25.VIII.1992, old fir forest, pitfall trap, (2, MUN); South Pond near South Brook, 11.VI.1979, D.J. Larson and D. Swales, (2, MUN).
Agathidium repentinum is newly recorded in Newfoundland and in Atlantic Canada ( Fig. 7). This northern species was collected in conifer, poplar, and taiga-willow forests in leaf litter, Sphagnum moss, and on moose dung ( Miller and Wheeler 2005).