Bohart and Griswold (1997) describe records of this species, Mexico. The genus Protodufourea as a whole is apparently restricted to pollen from the plant family Hydrophyllaceae, with known host plants from the genera Phacelia and Emmenanthe.
Protodufourea wasbaueri is known only from the type series from Idria, San Benito County, CA USA. There it visits Emmenanthe for pollen. No information on nesting biology or social behavior is given.
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