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The Carpenter-Bees Of The United States Of The Genus Xylocopa, Arthur J. Ackerman
The Carpenter-Bees Of The United States Of The Genus Xylocopa, Arthur J. Ackerman
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This paper forms the major part of a thesis for the degree of master of science at the Massachusetts Agricultural College, and it has been prepared under the supervision of Dr. H. T. Fernald. It is an endeavor to make more easy the identification of the bees of this genus.