Six small peatlands, comprising three bogs and three fens, were surveyed for spiders in southern Ontario or southwestern Quebec. Collections from the Mer Bleue bog contained representatives of 108 species (54.6% of the total), those from the Crieff fen 97 (49.0%), those from the Wylde Lake bog 77 (38.9%), those from the Oliver bog 76 (38.4%), those from the Richmond fen 59 (29.8%), and those from the Poltimore fen 49 species (24.8% of the total). The family Erigonidae had 24.8% of the total 198 species, Lycosidae had 11.1%, Linyphiidae had 10.6%, and Salticidae had 9.1%, Web-building species outnumbered hunting species by 118 to 80. The majority of species in these peatlands are wide-ranging litter inhabitants, about one-third are tree, shrub, or herb inhabitants, and one-tenth were found only in or on the surface of the peat itself. Nine of the last-named group appear to be restricted to bogs, but none appear to be restricted to fens.