Not sure if they are the same everywhere, but BW (and Brown Widow) egg sacks are pretty distictive:
from Yahoo Images, attributed to this link:
http://sciencedude.ocregister.com/2011/07/05/brown-widow-spider-can-you-find-her-eggs/131379/
Last edited by thingmon; 08-25-2012 at 09:14 PM..
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