Insect and Bug ID forum: Is this a black widow?

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Name: Dirt
(Zone 5b)
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dirtdorphins
Oct 9, 2014 8:08 PM CST
Thumb of 2014-10-10/dirtdorphins/41d9e4

I have seen many females, all black, with the classic red "hour glass" (way too many of them, actually) but I have never seen one like this?

Name: Janet Super Sleuth
Near Lincoln UK
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JRsbugs
Oct 10, 2014 7:15 AM CST
It appears to be a male from what I can see of the palps. There's more than one widow spider, your location could help (you can add it to your profile).

http://bugguide.net/node/view/1999/bgpage

Name: Paul
Utah (Zone 5b)
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Paul2032
Oct 10, 2014 7:29 AM CST
Looks like it to me...........
Paul Smith Pleasant Grove, Utah
Name: Dirt
(Zone 5b)
Plant Lover: Loves 'em all! Garden Photography Bee Lover Region: Utah Photo Contest Winner: 2014 Celebrating Gardening: 2015
Photo Contest Winner: 2015
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dirtdorphins
Oct 10, 2014 7:44 AM CST
Thanks Janet,
yes, I had looked on there...thought maybe a brown widow? but I am in northern Utah--

I'm primarily interested in learning how fearful I need to be about this spider because it is kind of 'in my way'
Name: Janet Super Sleuth
Near Lincoln UK
Charter ATP Member Organic Gardener Garden Photography Bee Lover Dragonflies Cat Lover
Butterflies Birds Plant Identifier I was one of the first 300 contributors to the plant database! Spiders!
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JRsbugs
Oct 10, 2014 7:48 AM CST
I've come to the conclusion it's 'probably' a Brown Widow, Latrodectus geometricus. I checked one of your photos in the plant database and found you are in Utah, which is in it's distribution or at least adjacent to.

http://www.spiders.us/species/latrodectus-geometricus/#range

https://www.google.co.uk/maps/place/Utah,+USA/@39.3209801,-1...

The Brown Widow Spider does have an hourglass but it is typically an orange shade rather than the vivid red of a black widow


http://cisr.ucr.edu/brown_widow_spider.html

[Last edited by JRsbugs - Oct 10, 2014 7:51 AM (+)]
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Name: Dirt
(Zone 5b)
Plant Lover: Loves 'em all! Garden Photography Bee Lover Region: Utah Photo Contest Winner: 2014 Celebrating Gardening: 2015
Photo Contest Winner: 2015
Image
dirtdorphins
Oct 12, 2014 10:58 AM CST
Or perhaps the Western Black Widow, L. hesperus,
males brown and can have orange hourglass

http://bugguide.net/node/view/26346#range
Name: Janet Super Sleuth
Near Lincoln UK
Charter ATP Member Organic Gardener Garden Photography Bee Lover Dragonflies Cat Lover
Butterflies Birds Plant Identifier I was one of the first 300 contributors to the plant database! Spiders!
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JRsbugs
Oct 12, 2014 11:56 AM CST
That seems possible!

Latrodectus hesperus ...

The preserved male has a black 'chest' where the live one has a pale median stripe on this Utah uni site .. they only show Latrodectus Hesperus.

http://utahpests.usu.edu/uppdl/htm/arthropod-pests-2011/arth...

Photos on the Californian edu site show a pale stripe ..

http://nathistoc.bio.uci.edu/spiders/Latrodectus%20hesperus....

There's only one photo showing the 'chest' of the male Latrodectus geometricus ...

http://nathistoc.bio.uci.edu/spiders/Latrodectus%20geometric...

One on bugguide of Latrodectus hesperus shows all black 'chest' ..

http://bugguide.net/node/view/13099

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