I can not visualize exactly how this is put together Dennis but the normal method is to push screening into the area. If this is how I visualize this I would get some expanded metal screening, maybe paint it black to reduce visiblility and then cut in strips, fold in 1/2 and push into the cracks.
I say expanded metal, as it has more spring and the edges will grip the sides of the pine. The bats should not be able to push away the metal.
It is good to have the bats around to remove the insects so I might make some bat houses to provide them an alternative place to live and remove the mosquitos. With the Nile virus around this is a good thing.

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