(One more -cidal word.) Or more particularly, mosquitoes of the genus Anopheles. As for why that of all forty-one genera of mosquitoes, it's the one that includes all the species that transmit malaria to humans. The word is a coined mishmash of Greek stem anopheles being from Greek an, not + óphelos, profit -- in other words, useless -- and Latin suffix for a killing or a killer.
My itchy ankle tells me we need an anophelicide -- quick, Henry, the Flit!