Question: where did the black widow spider get its name

title: Spider
text: Xiphosura ( horseshoe crabs ) Eurypterida † Chasmataspidida † Arachnida Scorpiones Opiliones ( harvestmen ) Pseudoscorpiones Solifugae ( sun spiders ) Palpigradi ( microwhip scorpions ) Trigonotarbida † Araneae ( spiders ) Haptopoda † Amblypygi ( whip spiders ) Thelyphonida ( whip scorpions ) Schizomida Ricinulei ( hooded tickspiders ) Anactinotrichida Acariformes ( mites )