Do mossies even interact with the hand? I thought they leech from creatures. Relying on the hand for sustenance seems... less than ideal.
According to mosquito.cos, mossie flies do interact with the hand (2 1 1) in their hunting subroutine, which is indeed odd! Now, I do remember reading somewhere that leaving the hand in the jungle for too long did cause the mossie flies to flourish - which is why the mosquito smacker and the other fix were invented.
You might also want to consider removing half of their eggs (classifier 2 18 20). They are flying, invisible agents that become active once the mosquito population within their range drops below a certain point.