Yellow Sac Spider
Small pale spider that builds silken sacs in corners during the day and wanders walls and ceilings at night. One of the few Ontario indoor spiders that occasionally bites humans, though bites are mild.
Body 5-10 mm, pale yellow to pale green, with darker chelicerae. Eight eyes in two rows. Sleek body without bold markings. Active at night.
Wall and ceiling junctions, behind picture frames, in folded curtains, and inside silken sacs in upper corners. Most active May through October indoors.
Mildly. Yellow sac spider bites are occasionally reported in Ontario. Bites cause local pain, redness, and minor swelling. Rarely require medical attention but should be cleaned and watched for unusual reactions.
Exterior perimeter treatment plus attention to interior wall junctions in active rooms. If bites are happening, schedule a treatment promptly.
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