Black Widow

Black Widow Spider term commonly used for three species of spider (L. Mactans, L. Hesperus and L. Variolus). They are found in much of North America and have a dangerous, but not fatal, neurotoxin in their bite- latrotoxin. (Just to be clear these three species do not cover the whole genus just three species in that genus.)

Description
Black widows are sexually dimorphic, meaning male and female spider are very different.