Zelus tetracanthus, the four-spurred assassin bug, is a species of assassin bug in the family Reduviidae.

[1][2][3] Adults are brown, black, or gray and have a body length of 10–16 mm.

Their antennae and legs are long and slender.

They have a row of four spurs across their thorax.

Both adults and nymphs use a sticky secretion to capture prey.