Here are a couple of "baby" Hemlock Woolly Adelgids on some of this year's growth of my Western Hemlock. This is the stage at which they become non-mobile (I missed the crawlers this year). I couldn't crop closer, because it was just too tiny.
I think that this photo and another that I will be posting after this one, should have a species page created for it as well as the one in this thumb. The non-mobile stage ("adult wingless"?) is

.
(Replaced photo with a slightly clearer one)