North Dakota

Hobo Spiders

Characteristics:
Size: Hobo spiders grow to about 1/2 inch long with a leg span of up to 1 1/2 inch.

Color: They are grayish brown with dark stripes and zigzag lines. They have long, hairy legs.

Habits: The hobo spider is also known as the aggressive house spider and is notorious for biting humans with little or no provocation. Like many spiders, it injects toxic venom when it bites that leads to tissue death and a lingering open wound. If the bite is delivered in fatty tissue, the lesion can be very deep and extensive, sometimes not healing for years. The hobo spider is very common in the Pacific Northwest, and is the most likely cause of serious spider bites there. The hobo spider creates a non-sticky funnel shaped web close to the ground often near a home�s foundation, under the siding or on plants and weeds. The hobo web has strings that trip the prey, which the hobo spider then attacks before it can escape.

What Do Hobo Spiders Eat?: Hobo spiders are hunters and eat any small invertebrate that touches their web.

Reproduction: The female hobo spider stays stationary in her web so the male must approach her for mating. The male bobs and taps at the funnel web�s entrance in a precise pattern. If his signals are not clear, the female may attack and kill him. If the female is responsive, the male slowly adds silk to her web and gradually approaches her. After mating, he leaves in search of other females. The female produces one to four egg cases, each one holding 50-100 eggs. The female attaches the egg cases underneath outdoor objects, although occasionally in crawlspaces. Hobo spiderlings hatch in June.

Other Information: The hobo spider's web is unusual, because the funnel opening is oval and not circular. The spider has very poor eyesight which explains why it is much more aggressive toward humans then other spiders. They have to attack to eat otherwise they would die of starvation.

Wolf Spiders

Characteristics:
Size: Wolf spiders vary in size from small species with only 1/2 inch leg spans to large ones whose legs may stretch out 5 inches.

Color: Wolf spiders are long legged and covered with short hairs, gray to brown to dark brown in color, and have several darker stripes.

Habits: Wolf spiders are large, hairy spiders not associated with a web. In fact, they only use silk for lining their nest and covering their eggs. They are very mobile, very fast, and very aggressive when threatened. Smaller species have been knows to run across the water of a swimming pool, suspended on the surface tension of the water. Retreats for the spiders are holes in the soil, under debris on the ground or within woodpiles. They commonly enter structures and can be found running across floors or walls as they search for food.

What Do Wolf Spiders Eat?: Wolf spiders are hunters and hunt for insect prey under cover of night.

Reproduction: The female constructs an egg sac of white papery silk, which she carries around attached with strong silk to her spinnerets. When the spiderlings hatch, they are carried around on the females back until they are ready to disperse by ballooning to the ground.

Other Information: Wolf spiders are often confused with the brown recluse, but they lack the violin-shaped marking behind the head. The wolf spider is shy and runs away when disturbed.

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