It sounds as if you are referring to orchard mason bees, Latin name Osmia lignaria. For instructions on how to build a block nest for them, see the following publication title "How to Raise and Manage Orchard Mason Bees for the Home Garden," authored by North Carolina Extension. The native eastern species of Orchard Mason Bee will nest in holes drilled in a wooden block. Untreated 4" x 6" lumber works great. Holes can be drilled in the wood on 3/4 inch centers. They should be 4-8" deep (depending upon the size lumber used), smooth, and a 5/16" diameter hole is important. Orchard mason bees need a source of moist soil or mud to construct their nests, so you may need to provide that if there isn't a source nearby. A tub of muddy soil should suffice. If you prefer not to build your own nesting block, they are available for purchase.
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