Noun
phoresis (uncountable)
Delivery or movement of a substance by means of an agent.
If their host dies, lice can opportunistically use phoresis to hitch a ride on a fly and attempt to find a new host. citation A louse's color varies from pale beige to dark gray; however, if feeding on blood, it may become considerably darker. Source: Internet
They can only survive for about three days after their host has died and they typically use phoresis, which is hitching a ride from a fly, as an attempt to reach a new host. Source: Internet
Mallophaga may also use phoresis in order to spread to a new host even if the present one is still alive. Source: Internet