Thanks! It took quite some pictures to get it right and luckily the sun was shining, so the light was ok (and a good camera+lens helps).
And I'm glad to have these babies. For a particular reason: my Eupolyphaga sinensis population is in quarantine due to a Sancassania berlesei mite problem. These mites came with the animals I bought. I haven't managed so far to get rid of the mites. They are though and have a special kind of nymph stage (hypopus) that attached itself with suckers to the roaches. They don't do harm to the roaches. They rather use the roaches as transport to food sources (phoresy). None the less I do not want them in my roach collection.
So I collect the ootheca, clean them thoroughly and keep them seperate. That way I hope to start a new colony without mites.
Well, now I have the first nymphs going