Observations on the nesting habits of some new world carpenter bees with remarks on their importance in the problem of species formation (hymenoptera: Apoidea)

Observations on the nesting habits of some new world carpenter bees with remarks on their importance in the problem of species formation (hymenoptera: Apoidea) - Annal of the Entomological society of America, 51, p.365-375, 1958 .