Hey hops I will gather more and try that. It looks like the young-killing is declining and the ants have probably carried off the carcass. But I did get a close look and did not see anything apparently wrong. Things looked properly-formed, nothing on their bodies, etc. Maybe they picked up enough of these pollen cells to alarm their nurses...will continue to explore possibilities and will post pic if I find enough on the ground. One problem is only thumbnails can be posted so a detailed group shot may be weak.