That looks like reddish brown sand had appeared on my floor the other day.
Tiny dirt piles coming in carpet.
I take the tiny piles of black course dust and when removed it leaves what looks like a burn mark that is difficult to clean and take out of a nice box.
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However if the dirt appears to be coming out from within the window frame or from behind the baseboard you re likely looking at something more significant than just what the wind blew in.
Baseboards and windowsills can collect small amounts of dirt over the normal course of daily life.
These are subterranean termites.
If they d appeared in the summer at the front of the house where it s sunny then i d assume it was ants but these have just appeared round the back of the house where it s shady and we never see any ants.
Pretty scary what can be lurking under the carpet.
I cleaned it up but by the next morning a new pile was being formed in the same place.
Unfortunately if frass is kicked out of a termite burrow in the ceiling or some other place it can fall unto the floor wooden or carpet where it is unlikely to ever be detected.
It was about the size of a quarter.
As they leave the infested wood they push the sawdust out.
Carpet beetles like to live out of sight and feed on the natural fibers in fabrics even living off carpet fibers that are 90 percent synthetic.
Thanks for any further help.
You can see the termites crawling in the dirt areas.
Look for holes in clothes and fabric woven furniture to begin identifying these critters.
It s been happening now for a few days.
It might be boric acid.
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After the larvae pupate and turn into adult beetles the adults bore tiny round exit holes in the wood.
An insect repellent often added beneath carpet and inside walls to prevent cockroaches and ants.
This is especially true for homeowners who have know clue what frass looks like.
I noticed this pile of.
If you look closely directly above the sawdust piles you may see the slits where carpenter ants push out their sawdust or you may see the round exit holes left by powderpost beetles.