> I know Seeley has listed preferred cavity sizes.  I don't remember if he lists a preference by type of tree.

TD Seeley reported:

We made external observations on 39 nests in hollow trees. We collected and dissected 21 of these tree nests to describe the nest architecture. No one tree genus strongly predominates among bee trees. 

Nest cavities are vertically elongate and approximately cylindrical. Most are 30 to 60 liters in volume and at the base of trees. Nest entrances tend to be small, 10 to 40 cm2, and at the nest bottom.

lnsectes Sociaux, Paris.
1976. Tome 23, no. 4, pp. 495-512.

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