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Bombus melanopygus
January - July (rarely as early as December)
Bombus californicus
February - September
Bombus vosnesenskii
January - September
Xylocopa tabaniformis orpifex
Later March - June
Ceratina
March - July
Xylocopa sonorina
March – September (Uncommon on Mount Diablo)
Brachymelecta californica
June - August
Melecta edwardsii
March - early June
Melecta separata callura
March - May
Nomada
February - June
Anthophora californicus
February - May; there may be a Fall generation too
Habropoda depressa
February - early June
Anthophora edwardsii
Earlier Spring (starting late-February/early March)
Anthophora pacifica
February and March - not common.
Anthophora urbana
Late Spring - Early Fall
Eucera
March to June
Melissodes
Late Summer to Fall
Diadasia bituberculata
April to June
