BLACK WIDOW:

Latrodectus hesperus, the Western black widow spider or Western widow, is a highly venomous spider species found in western regions of the United States of America. The female's body is 1416 millimeters in length and is black, often with an hourglass shaped red mark on the lower abdomen. The male of the species is around half this size and generally a tan color with lighter striping on the abdomen.