I found a good description of what happens in the brood cell here: http://www.ars.usda.gov/Research/docs.ht…44&page=14 There are good pictures of different stages in the development of the bee and of mite reproduction. There I also find the answer to my question and
Varroa defecation and pupa remains
I’m checking my, as I think, most promising colonies for the VSH trait. (http://www.elgon.es/diary/?p=146) After dragging out more than 1000 pupae I have learned a lot about analyzing what I see. But I understand it’s more to learn. And I’m