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Scentless Plant Bug? - Arhyssus scutatus

Scentless Plant Bug? - Arhyssus scutatus
In Westwood - elevation 5100ft, Lassen County, California, USA
December 15, 2011
Size: 5mm
My thanks for any further ID placement!

This bug was found indoors. Outside temperatures have been down in the teens lately, so maybe it has been indoors for some time.

Images of this individual: tag all
Scentless Plant Bug? - Arhyssus scutatus Scentless Plant Bug? - Arhyssus scutatus

Moved based on the following Dan Swanson's pers. comm.:
"My vote is for some species in the scutatus group of Arhyssus (scutatus, distinctus, schaeferi, crassus, barberi) and most likely is A. scutatus.
"Only a few options in Stictopleurus (only intermedius and plutonius, assuming not punctiventris, knighti, or viridicatus) and 5 mm is a little small for those (maybe ok for plutonius) (Göllner-Scheiding 1975). Same ref says "Paraclypeus relativ lang" for plutonius, maybe that corresponds to the tubercles? Nothing under Kopf of intermedius to indicate tubercles. Plus, both species were originally described as varieties of novaeboracensis (=punctiventris) so leads me to believe might not have large tubercles. I also think that in the images the metapleura are too conspicuous for Stictopleurus and I can't really make out the closed loops of the pronotal cicatrices (really clear in some of the S. punctiventris images). I dunno though, rhopalids are tough (esp. from photo).
"Seems that Arhyssus has a lot of viable candidates in CA and there is a lot of variability in A. scutatus. Scape is wrong for barberi, size too small for crassus, and out of range for schaeferi (sCA); distinctus has "antenniferous tubercle less prominent when viewed dorsally, rather depressed and sharply produced" (Chopra 1968) so we could probably do a guide page for A. scutatus."

Moved from Stictopleurus.

Thank you =v=, and Dan too, for your help in ID'ing thus nice bug!

Moved tentatively; nice one!
i don't remember seeing antenniferous tubercles as protruding as in this one, must be something...

Moved from True Bugs.