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Andrena
January - Fall (but primarily January - April)
Ashmeadiella
Summer
Diadasia bituberculata
April to June
Bombus melanopygus
January - July (rarely as early as December)
Bombus californicus
February - September
Anthophora californicus
February - May; there may be a Fall generation too
Brachymelecta californica
June - August
Perdita californica
April - June, timed to blooming of Mariposa Lily
Habropoda depressa
February - early June
Perdita interrupta
April - June, timed to blooming of California Poppy
Trachusa perdita
April - June
Anthidiellum notatum robertsonii
May - August
Chelostoma californicum
Colletes
March - Fall
Stelis
Dianthidium
Late May - August
Anthophora edwardsii
Earlier Spring (starting late-February/early March)
Melecta edwardsii
March - early June
Eucera
March to June
Xylocopa tabaniformis orpifex
Later March - June
Hoplitis
April - early June.
Hylaeus
April - September
Lasioglossum
Early Spring – Fall
Melecta separata callura
March - May
Megachile
Melissodes
Late Summer to Fall
Nomada
February - June
Osmia
Primarily April - June, but Osmia ribifloris biedermannii appears from January.
Anthophora pacifica
February and March - not common.
Panurginus
Early Spring
Protosmia rubifloris
April - August
Micralictoides ruficaudus
April and May
Ceratina
March - July
Halictus tripartitus
March - November
Anthophora urbana
Late Spring - Early Fall
Xylocopa sonorina
March – September (Uncommon on Mount Diablo)
Bombus vosnesenskii
January - September
