Other than the solitary thread-waisted wasps I typically find in grassy areas, I hardly ever encounter these wasps that live in groups. I recently stumbled upon a small group of thread-waisted wasps in the forest of North Aceh. I kept count and they had no more than ten. Compared to most thread-waisted wasps, this one is smaller. They build a sawdust-like, long nest on a small twig. They may belong to the Eremnophila aureonotata species, but this is just my educated guess.
All of the images here are my own work, taken with Xiaomi POCO NFC smartphone and an assembled external macro lens.