Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Fall Fund Drive

Black Spider with White Markings On Back  - Latrodectus hesperus

Black Spider with White Markings On Back - Latrodectus hesperus
Upland, San Bernardino County, California, USA
September 23, 2009
Size: 1/4th inch
This spider is frequently in my door frame in the afternoon. Perhaps cooling itself during heat of the day? No web in evidence. The markings on its back are very symmetrical though it doesn't appear so here. About the size of a dime, legs included.

Moved from ID Request.

Male Western Black Widow Spider
Latrodectus hesperus, looks like to me. Let's see what others think.
Welcome to Bugguide!

click to enlarge

I AGREE 100% - Lactrodectus hesperus
Given the overall appearance & proportions, I'm guessing an immature female ...possibly immature male (I don't see the development in the pedipalps suggestive of a mature male).

Thank you, Bill. I didn't know widows ever had white markings on them. If I can keep track of the spider, I'll try to shoot it (camera, that is) as it grows.

you're right - it's a female
I neglected to look closely at the pedipalps. I agree that it's a female. That being said, Tamara, be careful since it's in your door frame. Maybe it would be a good idea to relocate it outside away from the house where you won't accidentally get into unwanted contact with it.

Young Widow
Thanks so much! We're lousy with widows at home (this one is at my business office) but I've never seen the white markings before. I'll definitely be giving this spider a new home as soon as I spot him again!

Comment viewing options
Select your preferred way to display the comments and click 'Save settings' to activate your changes.