Ptilocnemus lemur is a species of feather-legged bug in the family Reduviidae native to Australia.

Commonly known as the feather-legged assassin bug, it is a predator with a specialized gland called a trichome that it uses to attract and paralyse ants before feeding on them.

It has a small head with a pair of feathery antennae with three segments, and a large down-curving proboscis, a wide thorax and a moderately broad abdomen.

It can be found on the trunks of trees where its drab colours help to camouflage it as it stands on the bark.

It then jerks and shakes the ant around, perhaps to prevent it from biting, and injects saliva into the wound.