Images of one of the larger ones I have found are at http://gallery.grajagan.org/v/public/thing/ . His buddies are generally half the size, so about 1/4 inch. Their tops are black, their undersides are greyish and their movements remind me of leaches. I found a couple (including the one in the photos) rearing their heads like cobras while crawling around on top of the soil. I have also found them eating strawberry fruits.
Any pointers would be very much appreciated. If anyone knows how to treat these organically, that would be great too!
thanks in advance, h.