Latrodectus hesperus
(Western Black Widow)

Picture ID 97147

Picture of Latrodectus hesperus (Western Black Widow) - Dorsal
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TangledWeb

This was probably an immature Western Black Widow, Latrodectus hesperus.

Paging12
Galvantula

Unlikely. Brown Widows usually have orange or yellow markings rather than red. They also have dark stripes on their legs. Not that I’ve ever seen a Brown Widow in person; I’ve only seen pictures.

TangledWeb

Paging, the link you used is for a pic of the underside of a Brown Widow, which has an orange-red mark. Your spider’s photo is of the topside (dorsal) of the spider, which has orange-red and white markings in immature spiders. So, they look similar to you because you are comparing the top of one species to the bottom of another. Here’s a dorsal photo of a fairly standard Brown Widow https://spiderid.com/picture/61459/ Some have orange stripes, some don’t. I asked our Site Moderator, Itsy Bitsy, to confirm the identification one way or the other. 🙂

ItsyBitsy

Filed. (Latrodectus hesperus)

Additional Pictures

Picture of Latrodectus hesperus (Western Black Widow) - Lateral Enlarge Picture
Picture of Latrodectus hesperus (Western Black Widow) - Dorsal Enlarge Picture
Picture of Latrodectus hesperus (Western Black Widow) - Male - Dorsal Enlarge Picture
Picture of Latrodectus hesperus (Western Black Widow) - Dorsal Enlarge Picture