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hobo=2 spider=8
If you mean the United States, the black widow spider. Others are the brown recluse, and the less well known hobo spider.
http://www.idph.state.il.us/envhealth/pcreclusespiders.htm Black widow and Brown Recluse
Yes, the brown recluse and the hobo spider bites can cause necrosis, where the flesh sloughs off around the bite area.
Sydney brown trapdoor spider was created in 1878.
brown recluse spider
The Brown Recluse spider.
Brown recluse
yes
The "Spitting Spider".
To be honest there are numerous kinds but the most common would probably be a wolf spider or a brown recluse it also has to do with the pattern if it has two rows of eyes then it is most likely a wolf spider
Brown Recluse Spider