螳臂当车

 螳臂当车 A mantis trying to wave down a car, i.e. attempting the impossible, over-rating one's own capacities.

 螳 mantis tang2

臂 bi4 arm

当 dang1 as

车 che1 chariot, car

茧jian3 cocoon.
 

蝴蝶
the insect 虫　which is like an uncivilized bearded  foreigner 胡
the insect on a leaf （trees木 have at least 30　世 leaves　on top of them)

Simplified leaf is ye叶　traditional is 30 on top of tree.