Termite and Wood Boring Insects - Possible termites? - please see pictures

For the past year, I've noticed strange piles of possible eggs/larvae shells on window sills and on concrete outside of my house. I recently repainted a window sill and then 3 months later, I see the following:

http://www.seas.ucla.edu/~pochi/picture1.jpg

If I brush off this pile, I then see a pin-sized HOLE underneath it:

http://www.seas.ucla.edu/~pochi/picture2.jpg

This is the second room that has had this. The other room was on a wall, and the pile of stuff was directly beneath it.

Does this look like termites? and if so, does this mean they are in my wall? Are there any remedies, or will a exterminator have to come and open the wall?

Thanks for any input!!!!

Excretal pellets (frass) are a distinguishing characteristic of drywood (non-subterranean) termites. These pellets are hard and have six distinct concave surfaces on the sides; only the ends are rounded. Certain anobiid (powder post) beetles also eject pellets from wood in which they feed. These pellets can easily be distinguished from those of drywood termites because they have rounded, convex surfaces

Large, consistent accumulations of pellets are a convincing sign the termites are active. Drywood termites may attack wood products of all kinds. Structural timbers and woodwork in buildings, as well as furniture and other wooden objects, may be damaged.

Calling an exterminator to confirm identification and to get the infestation under control is recommended.

can't see the pictures.how do you open them

You must copy and paste the links into your Address to view the pictures. Do not copy the http:// or the