This is a message from the Museumpests List. To post to this list send it as an email to pestlist@museumpests.net To unsubscribe please look at the footer of this email. ----------------------------------------------------------- Amber, Yes, looks like one of the Oecobius. Would like specimens anyway so we actually would have a record of occurrence. You could keep live ones as pets; they don't take up much room. It would be interesting to know what they are eating since many records list ants as a preferred food item. Don't know if anything is actually attracting them; the population is already in the building. Maybe local conditions moving them away from the normal areas in which they live. You are basically finding "large" ones, adults and not very small spiderlings. Although maybe spiderlings are not around this time of year. Maybe you're not seeing webs because the spiders are leaving webs and crawling about, at least, the males would do this. Lou
Louis N. Sorkin, B.C.E. Entomologist, Arachnologist Division of Invertebrate Zoology American Museum of Natural History Central Park West at 79th Street New York, New York 10024-5192 sor...@amnh.org<mailto:sor...@amnh.org> 212-769-5613 voice 212-769-5277 fax The New York Entomological Society, Inc. www.nyentsoc.org<http://www.nyentsoc.org/> n...@amnh.org<mailto:n...@amnh.org> From: ad...@museumpests.net [mailto:ad...@museumpests.net] On Behalf Of Morgan, Amber Sent: Monday, February 18, 2013 11:13 AM To: pestlist@museumpests.net Subject: [pestlist] FW: spider identification This is a message from the Museumpests List. To post to this list send it as an email to pestlist@museumpests.net<mailto:pestlist@museumpests.net> To unsubscribe please look at the footer of this email. ----------------------------------------------------------- Hi Louis, Thanks for the info - I'm sending better photos with a ruler for scale. The spiders are less than 1/16th of an inch long. We have not seen any webs yet. The areas we've found them in don't have windows, so I'm not sure where to look, but it's possible we are vacuuming them up before we get a chance to see them. If you'd really like me to send you one I can, but they are all stuck on sticky traps so I'm not sure how well they will travel. Generally spiders don't trouble me, but this increase in tiny spider population makes me wonder if there is something else going on that is attracting them. Thanks, Amber From: ad...@museumpests.net<mailto:ad...@museumpests.net> [mailto:ad...@museumpests.net] On Behalf Of Louis Sorkin Sent: Friday, February 15, 2013 6:23 PM To: pestlist@museumpests.net<mailto:pestlist@museumpests.net> Subject: [pestlist] FW: spider identification This is a message from the Museumpests List. To post to this list send it as an email to pestlist@museumpests.net<mailto:pestlist@museumpests.net> To unsubscribe please look at the footer of this email. ----------------------------------------------------------- It is a male spider, but I was looking at a postage stamp size image and now I'm wondering if it's possible, Amber, to send some over for examination just to be sure. Louis N. Sorkin, B.C.E. Entomologist, Arachnologist Division of Invertebrate Zoology American Museum of Natural History Central Park West at 79th Street New York, New York 10024-5192 sor...@amnh.org<mailto:sor...@amnh.org> 212-769-5613 voice 212-769-5277 fax The New York Entomological Society, Inc. www.nyentsoc.org<http://www.nyentsoc.org/> n...@amnh.org<mailto:n...@amnh.org> From: ad...@museumpests.net<mailto:ad...@museumpests.net> [mailto:ad...@museumpests.net] On Behalf Of Louis Sorkin Sent: Friday, February 15, 2013 5:29 PM To: pestlist@museumpests.net<mailto:pestlist@museumpests.net> Subject: [pestlist] RE: spider identification This is a message from the Museumpests List. To post to this list send it as an email to pestlist@museumpests.net<mailto:pestlist@museumpests.net> To unsubscribe please look at the footer of this email. ----------------------------------------------------------- That's a male. You can tell by the modified, enlarged palpi. It is a member of the family Oecobiidae. Most likely, depending on where you live, either Oecobius navus Blackwall, 1859....................Cosmopolitan or Oecobius cellariorum (Dugès, 1836) *....................Cosmopolitan The species are quite common indoors, often in a distinctive kind of web near window frames. Web consists of 2 thin, silken sheets connected by some silk lines radiating from the sheets to act as trip lines. The spider lives between the two sheets, residing on the lower one. Webs can be along window frames, ceilings, walls, floors, sort of edges where structures come together. The common name is flatmesh weavers. Has a cribellum (in front of spinnerets) and anal tubercle with a brush of special bristles that aid in spreading the silk from the posterior spinnerets as it encircles prey. It has a distinctive shape to its body and leg attachment and display. Distinctive looking cephalothorax, eye structure and arrangement. Prey capture behavior very interesting. They often feed on ants. Have you seen booklice in the webs? Louis N. Sorkin, B.C.E. Entomologist, Arachnologist Division of Invertebrate Zoology American Museum of Natural History Central Park West at 79th Street New York, New York 10024-5192 sor...@amnh.org<mailto:sor...@amnh.org> 212-769-5613 voice 212-769-5277 fax The New York Entomological Society, Inc. www.nyentsoc.org<http://www.nyentsoc.org/> n...@amnh.org<mailto:n...@amnh.org> From: ad...@museumpests.net<mailto:ad...@museumpests.net> [mailto:ad...@museumpests.net] On Behalf Of Morgan, Amber Sent: Friday, February 15, 2013 4:54 PM To: pestlist@museumpests.net<mailto:pestlist@museumpests.net> Subject: [pestlist] spider identification This is a message from the Museumpests List. To post to this list send it as an email to pestlist@museumpests.net<mailto:pestlist@museumpests.net> To unsubscribe please look at the footer of this email. ----------------------------------------------------------- Hello List, We've seen a few of these tiny spiders on our sticky traps. We find them in an area that tends to have higher humidity and a (slowly decreasing) population of psocids. We'd like to find out more info about this spider - if it's specifically drawn to humidity or psocids, or if it's an indication of some other, as-of-yet-undiscovered issue. Thanks! Amber the warhol: Amber E. 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