Cockroach 4 Headlouse 4Ever

Two little parasites sitting in a tree,
Both crawling, stinging, bothering me.
She evades pesticides, pills, poison floods;
And he always jumps back, to suck out my blood.
He bites, it hurts, he makes me itch,
And she springs back my trap with cackle of witch.
Let them rot together in a vermin's hell,
Where only his fangs can dent her inky shell.
They're a perfect little couple, insects together:
Cockroach for headlouse forever.