Latrodectus hesperus
(Western Black Widow)

Picture ID 55429

Picture of Latrodectus hesperus (Western Black Widow) - Dorsal

Comments & ID Thoughts

My guess is that this species is (Latrodectus hasselti) or the Redback Spider. There is a red hour glass shape on the ventral abdomen and long red stripe down the dorsal part of the abdomen. This is my best guess and there is a serious complication with this identification as it is stated to be native to Australia and New Zealand. This spider and subsequent photo are found and taken in Idaho, United States. I would like to know why there is a red stripe down the back if it is not in fact, Latrodectus hasselti.

It was found in a cool and damp corner next to my daughter's window. It was found in a very tough and sticky web.

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Sam.smithBugmanDan Recent comment authors
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BugmanDan
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Hi, if you found these spiders in Idaho, they will both be the western black widow, Latrodectus hesperus.
T one with the stripe down the dorsum would likely be sub adult. that will probably vanish when the spider molts to penultimate or full adult.

Additional Pictures

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