Cobeweb spiders are part of the Theridiidae family of spiders.
But wait, you say, don't all spiders make cobwebs? That's not true at all! Many spiders leap on their victims, and other spiders create other sorts of webs. Cobweb spiders specifically make the little flimsy corner-of-the-room type of webs. That's different from, for example, the solid spiral webs - "Charlotte's Web" web - that orb spiders make.
This spider is in particular a Anelosimus studiosus - a type of social cobweb spider.
Here is a different cobweb spider, photographed in 2009. The actual images are much larger - right click on them to see the full size.
More photos of Cobweb Spiders
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Spiders in Sutton Massachusetts
Animals and Birds in Sutton Massachusetts
Sutton Massachusetts Photo Collection