Original: The name Death's - head Hawkmoth refers to any one of the three species (A. atropos, A. styx and A. lachesis) of moth in the genus Acherontia.
Simplified: The name Death's - head Hawkmoth is used for three types of moth. The (A. atropos, A. styx and A. lachesis), and are in the genus Acherontia.