Body length of adult females 4.8 - 7.3mm, of adult males 4.4 - 6.0mm.(1)
Imported (from Europe) and has been officially collected in these localities so far, according to published literature:
Canada: British Columbia(2), Newfoundland(1)(2), Nova Scotia(1)(2), New Brunswick(1)(2), Quebec(1)(2), Ontario(1)(2)
USA: Maine(1), New Hampshire(1), Washington (first record for the state from Orcas Island in 2002, see here)
Usually found on man-made structures, like barns and garages.
Evidence indicates that S. bipunctata, which closely resembles the native S. borealis in size, colour, microhabitat, diet activity, prey selection and utilization, life history, and sexual behaviour, can displace S. borealis.(3)
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