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Photo#335679
Sac Spider? Worcester County MA - Trachelas tranquillus

Sac Spider? Worcester County MA - Trachelas tranquillus
Worcester County, Massachusetts, USA
I thought this was a sac spider - it looks similar to several others we've photographed - but the colors seem "backwards" on this one compared with our other common ones!

Images of this individual: tag all
Sac Spider? Worcester County MA - Trachelas tranquillus Sac Spider? Worcester County MA - Trachelas tranquillus Sac Spider? Worcester County MA - Trachelas tranquillus

Moved
Moved from ID Request.

Trachelas
Try genus Trachelas.

 
Autumn spiders
Oh! Your description says they come inside in autumn to hibernate - and we promptly put it back outside again! Oops!

That is neat, we've never had one of those before. Thanks!

So is this probably the Trachelas tranquillus? It seems to look most like that one!

 
Yes, based on location alone,
Yes, based on location alone, it seems that it would pretty much have to be T. tranquillus.

-K

 
Autumn visitor
Yes just to make more clear we've been photographing all spiders we've seen in and outside the house all year long and this is the first time we've seen this spider. It was inside the house, and it was as temperatures started to cool in September. So it does seem to follow the timeline that I read here on your site, that they sometimes come inside in the fall looking to hibernate.

 
I unfortunately don't know en
I unfortunately don't know enough about them to say what species for sure.

I can tell you this is a male though.

 
Trachelas sp.
I think you got it right Jebus, and I'm not sure on species either.

 
species
Just in case we have another one looking to hibernate in the next few weeks, is there a particular angle of picture that would help out with knowing the species? Is there a part of the spider we need to get a clear photo of?

 
For another male, the same si
For another male, the same side view of the pedipalp that you already have, but closer, if possible, and with better light.

But I have no practical doubt about the species, and you already have an excellent view of leg I (pictured in Platnick & Shadab, 1974).

-K

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