Hobo spiders

Asked July 24, 2017, 11:55 AM EDT

I'm fairly certain I found a few hobo spiders in my house. The markings seemed to match, it was about 1.75 inches long including the legs, it had furry legs. I've attached some pictures of it alive. We have been doing some remodel and the doors sometimes get left open. Is this something I should be concerned about?

Clackamas County Oregon

5 Responses

Hello again,

Sorry to hear that you are once again puzzled about a mystery spider. As I said previously, “When it comes to the hobo spider, it doesn’t live up to its over-inflated reputation.” In other words, you don’t have any reason for concern.

Thank you for the images. The spider resembles the hobo but, to verify the identification, we must see the underside.

If you still have the spider, you might take a well-focused image of the underside and attach it when you reply to this email. An alternative is to take the spider to the Clackamas County Master Gardener Office, 200 Warner-Milne Road, Oregon City. Hours weekdays 9 to noon and 1 to 4; closed holidays.

See “Hobo Spider. Eratigena agrestishttp://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1769&context=extension_curall

Good to know I don't need to worry. It's still a little unsettling. I have a picture of the bottom side, but it had already been killed and kind of smashed.

Thank you for the image. Even though it's a bit squashed, it appears to be a giant house spider (Eratigena atrica) rather than a hobo spider (Eratigena agrestis).

So here's the really good news. Giant house spiders are thought to be predators of its close relatives, hobo spiders in part because they compete for the same ecological niche. Some entomologists think that giant house spiders may kill hobos.

Wow! That document was very very helpful! Took a closer look at all the features of the spider and could see how it was a giant house spider not a hobo. I'm pretty interested in spiders and learning how to properly identify them. I often capture them before or after they die to try to figure it out. Do you have any other helpful spider identification documents you wouldn't mind sharing with me? I'd really appreciate it.

Thanks! Sarah

Most spider references are quite broad in their coverage. However this site of "Common spiders of Portland, Oregon" was set up by a student at Portland State:University.

And this might also be useful: "Oregon Spiders" http://www.spiders.us/species/filter/oregon/ .

Then, too, here's what I wrote for the Master Gardeners in 2015; see page 6: http://extension.oregonstate.edu/mg/metro/sites/default/files/october_2015_mg_newsletter_9_30_15_.pdf.