Only TWO such spiders that may present a danger in terms of their bite occur here. They are the aggressive House and Black Widow spiders. The Aggressive House Spider, Tegenaria agrestis, is called such because some specimens bite with little provocation and because they move forward to attack when cornered or threatened. More importantly, the name serves to alert individuals to the fact that this spider is potentially dangerous and should be approached with caution. Therefore, ulcerated lesions of this type are probably due to bites by the aggressive house spider.
Males are somewhat more venomous than females.
Bites commonly occur when firewood is picked up because spiders love to build their webs in places that are dark and secluded. Bites can also occur when putting on an article of clothing that has been left on the floor, because this is another desired spider habitat. Although these spiders are not known climbers, bites do occur in the bed as they can crawl up any bedding that is floor length. They also have been found in sinks, bathtubs, shoes, and childrens toys. The initial bite is not painful and has been described as producing a very slight prick sensation.