Males, when they become adult, are distinguished by the sex organs on the ends of the palps which look rather like a pair of boxing gloves. Young spiders (resembling small versions of the adults) hatch from the egg sac and grow to maturity within a year. These are permanent structures which can attain considerable size (and dustiness!) in an undisturbed cellar, shed or garage. House spiders build cobwebs consisting of a silken sheet which funnels into a retreat at the back. Before long, few locations where there are houses will remain free of them. In Britain, Tegenaria house spiders are still in the process of expanding their range in the north of England and Scotland. The natural habitat of the spiders includes caves and hollow trees but, of course, they readily adapt to buildings. Most of our species of Tegenaria were probably introduced into this country during the last few centuries among imported cargoes from the Mediterranean Region. HOUSE SPIDER FULLThey are less likely to be full time occupants of our living areas due to disturbance. Their sheet-like webs are usually built in garages, sheds, loft spaces and cavity walls. They range in size from the relatively small Tegenaria domestica to the quite large Tegenaria parietina, which can reach a leg span of 120mm (5 inches) in the adult male. Six species of this group are commonly found in homes, and you may often find them in the bath or dashing across the living room floor. They frequently enter homes through open windows, chimneys or gaps beneath doors.Ī large spider with a brown cephalothorax (the fused head and thorax) and a tan-coloured abdomen that often has a characteristic ‘herring bone’ pattern. Season: These spiders are usually seen in the autumn months when males leave their webs in search of females.
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