assassin bug

Short definition from Wiktionary

Noun

1. 1
   Any true bug from the subfamily Reduviinae of the family Reduviidae, all of which eat other insects. They can inflict a very painful bite, but don't cause disease.
2. 2
   Any true bug from any of the subfamilies of the Reduviidae, including those in the subfamily Triatominae, which suck blood and may transmit Chagas' disease to humans.