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There are a number of black Spiders with red on their backs. The most commonly referenced one is probably the black widow. But it is not the only one, and not all of them have red on their backs.

It might help to note that the female black widow is mostly black, and may or may not have red (or red-to-orange color) on its "back" or the top sIde of its abdomen. (Viewed from the top or above, the female black widow is all or almost all black.) Some have a splash of red on their "back" or the top of their abdomen. Additionally, the hourglass that appears on the female L. mactans varies a bit from red to orange, and can be very dark in color. This characteristic mark is always on the bottom or ventral side of its abdomen.

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14y ago

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