Alfalfa Leafcutting Bee Biology and Management
   Discusses lifecycle, management, and nesting activities.
   http://www.pollination.com/managed/alfalfabee.cfm

Current Status of the Alfalfa Leafcutting Bee Megachile rotundata, as a Pollinator of Alfalfa Seed
   Discusses management, diseases, and the future of using these bees, in conjunction with honey bees, to pollinate Alfalfa crops in California.
   http://www.pollination.com/publications/IPSpub02.cfm

Megachile Species
   Photographs of different species, mostly mounted.
   http://cedarcreek.umn.edu/insects/album/025068022ap.html