The common name, “Hobo Spider” comes from this spider’s method of very rapidly expanding its distribution by hitching rides with humans along major highways in the Pacific Northwest; it was formerly known as the aggressive house spider.
Color caries from light to medium brown, with dark stripe on either side of the lighter midline stripe. They are about 1-1 3/4” in diameter. Hobo spiders have a 2-year life cycle. Mating occurs in the autumn.
The bite of these spiders typically produces a necrotic lesion like that caused by brown recluse spiders. The initial bite produces a very slight prickling sensation. Within 3 minutes or less, a small, insensitive, hard area appears which is surrounded by an expanding redden area of 2-6” in diameter. Within 15-35 minutes the area blisters. About 24 hours later the blister usually breaks, and the wound oozes serum. The cratered ulcer crusts over to from a scab. It may take several months to heal and often leaves a permanent scar.
Hobo spiders may be found in almost any habitat containing holes, cracks, or crevice which can support tunnel formation. Since they are poor climbers, they are rarely found above ground level. They frequent dark, moist areas, and are most often found in basements, window wells, and crawl spaces.