beetledude 的最愛

Since the discovery of the Cionus pupa covered in soil, https://www.inaturalist.org/observations/191465167 I re-read something that @beetledude wrote , viz, "Keep a look out for their remarkable cocoons. They produce a unique, opaque, thin-parchment-like "bubble" inside which the pupa is housed. These cocoons are also attached to the outside of the hostplant, often on leaves." (https://www.inaturalist.org/observations/9177433)
And @borisb wrote: "btw: These pupate in tiny, globular cocoons attached to plant (rare in weevils)".
(https://www.inaturalist.org/observations/191465167)

So I wondered, why then, when we sit under a Buddleja, we get pelted with little sticky larvae apparently flinging themselves from the tree?
I put 6 larvae in 4 containers, on Buddleja sprigs. Soil was either piled in one quarter of the floor space or covered the floor. The pupae were located as follows:
2 attached to leaves;
2 were lying on top of the soil;
2 had attached themselves to the bare plastic on the bottom of the container.