Hobo Spider

OVERVIEW

The common name for the hobo spider comes from its presumed method of expanding its distribution by hitching rides with humans along major highways in the Pacific Northwest. In fact, the hobo spider was introduced from Europe in the 1930s and has become established in at least 6 states since, displacing many native spider species as it spreads.
To avoid hobo spiders, seal cracks on the outside of the home, and screen all doors and windows. Reduce clutter in basements and garages to eliminate hiding spots and keep these areas dry. Avoid storing clothing or shoes on the floor and use caution when moving items that have been stored for a long period of time. To get rid of hobo spiders, contact Critter Removers today (801) 888-5474.

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Biology & Behavior

The hobo spider, sometimes called the aggressive house spider, was first identified in Utah in 1990. The hobo spider is of importance because its bite causes necrotic wounds similar to those of the brown recluse spider. ​The hobo spider builds funnel or tube shaped webs. It is long legged and swift running spider. It has a brown cephalothorax and brown legs. The abdomen has a distinctive pattern of yellowish markings on a greyish background, although this pattern may be hard to see without a microscope. ​The complete life cycle of the hobo spider lasts for two years. Hobo spiders prefer to use habitats that have holes or cracks to support their funnel like webs. They are poor climbers and are rarely seen above ground level. ​Hobo spiders are most commonly encountered from June through September. Males generally have a more toxic bite than females, while immature hobo spider bites seem to produce the most serious wounds. Females of the species tend to stay in their webs and are not usual found running about. ​The hobo spider is medically important because of its ability to cause necrotic wounds. Necrotic spider bites have been reported in Utah for many years and are usually blamed on the brown recluse spider. As of 2003, only a few specimens of the brown recluse spider have been documented in Utah and these were imported. ​The bite of the hobo spider is relatively painless and is reported to feel like a pinprick. Within 15 minutes of the bite, numbing sensations may occur at the bite site and other areas of the body and dizziness may occur. After about one hour, reddening around the bite begins and enlarges in area. The bite site becomes hardened and swollen within about 18 hours. Blistering at the bite, visual or auditory disturbances, severe headache, weakness and joint pains may occur within the first 36 hours. ​Within 24 to 36 hours a discharge of fluids and blistering may occur. After 2 or 3 days, the area around the wound may blacken. After 7 to 10 days the necrotic area will usually take on a characteristic elliptical shape. Spells of nausea and sweating often persist through this time period and headaches may persist even longer.

Diseases

Damage

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