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Photo#832137
Latrodectus hesperus - male

Latrodectus hesperus - Male
Residence near Rosebowl, Pasadena, Los Angeles County, California, USA
April 17, 2011
Have had Western Black Widow spiders in a niche on that corner of my house for some years. The non-native Brown Widow spiders are less picky regarding habitat. I find the latter in relatively open places, like on my garbage can. For SoCal this page at UC Riverside is very helpful distinguishing L. hesperus from L. geometricus.