University of California
Two species of leaf-cutter bees were accidentally introduced into the United States and now occur in California: Megachile rotundata (Fabricius) and Megachile concinna Smith. This publication deals only with M. rotunda ta, which is now established through-out the Sacramento and San Joaquin Valleys and the northern mountain counties of California.
Burton, V. E.; MacSwain, J. W.; Marble, V. L.; and Stanger, W., "Pollinating Alfalfa with Leaf-Cutter Bees" (1964). Bu. Paper 40.
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