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The sequence of families used is that of West et al. (1984), with some exceptions. The generic and specific names are arranged alphabetically. Those species new to the province are marked by an asterisk (139 species). For each species, collection localities are listed by a grid system, e.g., B2 (Fig. 2); the depositories in which Manitoba material is found follow in brackets, abbreviated and in capital letters; next is the overall distribution, e.g., nearctic, a more specific distribution if known, e.g., boreal, possibly a major vegetation zone or macrohabitat, e.g., mixed forest (see Fig. 1), and microhabitat, e.g., leaf litter. For. some specimens, not all of this information was available. Specimens were gathered in snow-free months by pitfall traps, sweeping nets, beating trays, and suction traps, and in winter by subnivean pitfall traps (Aitchison, 1978, 1984). Publications used for identification include Chamberlin & Certsch (1958), Dondale & Redner (1978, 1982, 1990), Griswold (1987), Ivie (1965, 1969), Leech (1972), Levi (1954, 1955, 1957, 1971, 1973, 1974, 1980, 1981), Millidge (1981a and b, 1983, 1984, 1987), Opell & Beatty (1976), and Platnick & Shadab (1975a and b, 1976, 1977, 1981, 1982, 1988).

The collections mentioned are abbreviated as follows: AC: Agriculture Canada Research Station, Winnipeg, Man. R3T 2M9; AIT: Dr C. W. Aitchison-Benell; AMNH: American Museum of Natural History, Central Park West at 79th St., New York, NY 10024; BUC: Mr D. J. Buckle, 620 Albert Ave., Saskatoon, Sask. S7N IG7; CAR: Dr R. T. Carter, Department of Linguistics, University of Manitoba, Winnipeg, Man. R3T 2N2; CNC: Canadian National Collection of Insects and Arachnids, Central Experimental Farm, Ottawa, Ont. KIA 0C6; COS: Dr S. Cosens, Freshwater Institute, Fisheries and Oceans Canada, 501 University Ave., Winnipeg, Man. R3T 2N6; MMMN: Manitoba Museum of Man and Nature, 190 Rupert Ave., Winnipeg, Man. R3B ON2; MCZ:

Museum of Comparative Zoology, Harvard University, Cambridge, MA 02138; PRE: Dr. W. B. Preston, Department of Lower Vertebrates, Manitoba Museum of Man and Nature, 190 Rupert Ave., Winnipeg, Man R3B ON2; ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ont. M5S 2C6.

The principal identifiers of collections are the following: Dr. C. W. Aitchison-Benell, Mr D. J. Buckle; Dr C. D. Dondale; Mr J. H. Redner, Centre for Land and Biological Resources Research, Central Experimental Farm, Ottawa, Ontario KIA 0C6.