Therefore with their poor eye sight, they think humans or anything that moves probably, are prey and attack. Their web is not sticky either which makes it harder for them to catch prey. The reason hobo spiders have a reputation for being so aggressive is because they have very poor eye sight and have to aggressively attack their prey to catch it. Finally, in 1983, field studies revealed that the Hobo Spider was the actual cause of such bites in the northwest, and the spiders' ability to produce necrotic lesions and systemic illness was demonstrated in the laboratory in 1986.
Studies conducted between 19 suggested that another spider was probably the actual agent of these bites.
In the late 1960's and early 1970's physicians in Idaho, Oregon and Washington were presented with cases of probable spider bite that closely resembled bites caused by the brown recluse spider, Loxosceles reclusa. In the United States however, the Hobo Spider rapidly adapted to living in urban areas, and without the widespread presence of a dominant competitor, became abundant and began to extend its range by 1968 it had become established as far east as Spokane, Washington and Moscow, Idaho, and as far south as Corvallis, Oregon. In its native Europe the Hobo Spider is a resident of fields, rarely entering human habitations due to the presence of major competitors, particularly the giant house spider, Tegenaria gigantea, which is a common resident of houses and other man-made structures in Europe therefore, human contacts with the hobo spider are uncommon in Europe. Considering the seasonal nature of the Hobo Spider, it is highly unlikely that a viable breeding population would have developed in the United States based upon the occasional introduction of adult or juvenile specimens. It is highly probable that they were transported to and arrived in the Port of Seattle as egg cases attached to wood, etc., rather than as live spiders. The means of the spiders' introduction into the United States was almost certainly commercial shipping vessels carrying cargo originating from agricultural areas of Europe. Hobo spiders belong to the family Agelenidae or funnel web weavers which is indigenous to western Europe that was introduced into the north western United States (Port of Seattle) sometime before the 1930's.
Hobo spider professional#
Several other spiders resemble hobo spiders only an arachnologist, or other specifically trained person should attempt to make a positive identification of this species: In an instance where a spider has bitten a person, it is imperative to obtain positive identication only from a qualified professional arachnologist. The female generally has a larger abdomen than the male, and does not have swollen "boxing gloves" at the ends of the pedipalps.
The male sports two pedipalps (antennae like protuberances) between the two front legs, which are swollen at the ends, looking somewhat like a pair of boxing gloves these "boxing gloves" are actually the male genitalia, not "fangs" or "poison sacs". The dorsal abdomen exhibits a "herringbone" or multiple chevron pattern, which may be quite obscure in darker individuals. The adult Hobo spider is a moderately large (12-18 mm body length) brown spider, with long, unmarked legs (legs included, a typical specimen would fit nicely on a silver dollar). Hobo Spiders (Tegenaria agrestis) - These spiders belong to the Tegenaria family of spiders.
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