You should be concerned when the symptoms do no improve within 24 hours and there is numbness or increase in pain. The greatest risk of a spider bite is anaphylaxis: the allergic reaction to spider venom that is sometimes encountered with very sensitive people. Hives, wheezing, shortness of breath and weakness are the general symptoms associated with anaphylaxis, therefore call 911 right away if you notice any such symptoms. Despite its diversity, all the huntsman spider specimens have eight eyes disposed on various parts of the body, and a good vision for the close and distant potential pray. Unlike the general opinion that associates spiders with webs, this is not the case with the huntsman spider: this species goes out to hunt its pray as it doesn't wait for it to get caught in a web. The most risky of situtations have been registered in the case of children under seven, who have been bitten by this insect; an equally high risk is present with people that have a very fragile immune system. The severest form that a brown recluse spider bite can get is that of necrosis when the deep tissues are affected and get gangrenous; the venom actually destroys the soft tissue, the area heals very slowly and scarring is inevitable. The whole purpose of weaving a web or creating a maze of threads is to make the perfect trap for catching prey; yet, the brown recluse spider does not consider that enough. The males are likely to leave their nest and go hunt somewhere else, while the females will not go far from the web. Their favorite hunting moment is the night, when there are less chances of being disturbed, threatened or exposed to the dangers of the outside world. They are found almost everywhere on the North American continent except the area at the west of the Rocky Mountains; what seems even more interesting is the fact that a variety of brown recluse spiders is also found in Hawaii. In its natural habitat the species prefers rotten tree bark as the favorite place to make the nest, but it is also found in alls sorts of house corners. The common prey of the hobo spider includes carpet beetles, earwigs, houseflies and silverfish. The hunting habits are the same regardless of whether we are talking about the hobo spiders that live indoors or out in the fields, gardens and hedges. The worst consequence of a hobo spider bite is the death of the tissue or necrosis; it is due to such a risk that the general opinion considers the hobo spider highly dangerous.