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Prothysana felderi
The Shag-carpet caterpillar is a species of moth. It is found from Mexico, south to Panama and into South America, at least to Ecuador.
Rainforest
Also called Tarchon felderi.
The white "things" might mimicrying being parazited by a wasp and might show: Already occupied, so further attack by another wasp might be prevented. That's only my guess...