Cobweb Spider
Genus Robertus

brown and black spider
On Antelope Island I came across a fence post that was covered with tiny black spiders running
around spinning webs from every stick that was poking out. 

cobweb spider
This little male seemed to be the most industrious so I studied him for quite a while.  I had to be careful
that he didn't spin a web over to me and make me or my camera part of his webbing.

Robertus spider
Some of them were just biding time on the post and when a good breeze came
up they ballooned off to places unknown.  What a neat group of arachnids.
Bugguide helped me with identification of these little cobweb spiders.

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