These planthoppers in the family Derbidae are feeding on the yellow stem.
You can clearly see the left one’s beak (rostrum) inserted in the stem. Next time I’ll have to try and get a good profile shot. They really are odd looking.
Also odd are those Velcro like hooks along the leading edge of the wing.
Both commenters on the last identification challenge correctly identified the critter above as a planthopper in the family Derbidae.
At a glance, you might mistake these hemipterans for lepidopterans. The first thing you might notice as being a bit off are those antennae. If you look closely enough, you’ll see the typical hemipteran rostrum.
Here’s another one, with what appears to be an abdominal injury.