Black-tailed Red Sheetweaver

About as common as the funnel-weaving Grass Spiders (Agelenopsis spp.), the Black-tailed Red Sheetweaver (Florinda coccinea) also builds non-sticky, horizontal webs in low-lying foliage. Like the Funnel Weaver's 3D barrier, the Sheetweaver spins some stopping threads to intercept flying insects and knock them into the web, where it attacks them. Early this spring, we had several in our Phlox, but they seem to have moved on. This species is characterized by bright red body color and a black caudal tubercle. Here are some photos of a female:

Unfortunately I wasn't able to get the caudal tubercle in focus, but you can see it as a blurry black mark on the end of the abdomen.

Along with the Bowl and Doily Weaver (Frontinella communis), the Black-tailed Red Sheetweaver belongs to the family Linyphiidae (Sheetweb Spiders). 

**Warning: This spider is dangerous to humans, so handle with caution.

References:

http://bugguide.net/node/view/67291

http://www.floridanature.org/species.asp?species=Florinda_coccinea

http://www.jstor.org/discover/10.2307/3705543?uid=3739896&uid=2&uid=4&uid=3739256&sid=21102091251693 (development & reproductive potential)

http://www.ask.com/answers/216186221/is-the-black-tailed-red-sheetweaver-poisonous