Caspers Wilderness Park, San Juan Capistrano, Orange County, CA. 4-6-10. © Ron Hemberger 		Mason Bee

Osmia coloradensis

Hymenoptera: Megachilidae

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Caspers Wilderness Park, San Juan Capistrano, Orange County, CA. 4-6-10. © Ron Hemberger
Caspers Wilderness Park, San Juan Capistrano, Orange County, CA. 4-6-10. © Ron Hemberger

San Joaquin Marsh, Irvine, Orange County, CA. 5/31/13. © Ron Hemberger