Should add that sub-adult Western Black Widows(Latrodectus hesperus) can have colored patterns on the top of their abdomen in addition to the red hourglass on the under side. That may be the case here. Doesn’t have the solid red on black that an adult Southern Black Widow usually has.
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Looks like another female Southern Black Widow. Latrodectus mactans.
Should add that sub-adult Western Black Widows(Latrodectus hesperus) can have colored patterns on the top of their abdomen in addition to the red hourglass on the under side. That may be the case here. Doesn’t have the solid red on black that an adult Southern Black Widow usually has.