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Photo#1572396
What sort of bee / wasp / hornet is this, and what is she doing? - Mallophora - female

What sort of bee / wasp / hornet is this, and what is she doing? - Mallophora - Female
Los Angeles, Los Angeles County, California, USA
August 9, 2018
This morning, I saw this bee on the rim of one of my tomato cages. The bee was depositing a white substance along the rim (eggs? nestbuilding? I don't know), and I was wondering if anyone could tell me what sort of bee this is and what she's doing. Thank you! My curiosity is killing me!

Images of this individual: tag all
What sort of bee is this, and what is she doing? - Mallophora What sort of bee / wasp / hornet is this, and what is she doing? - Mallophora - female

This genus
of robber flies does egglay with this white foamy exudate which hardens. The shape of the mass may actually be species specific though I had not noted this before.

Moved
Moved for expert attention.

Fly
This doesn't look like a bee to me. I believe it to be a robber fly, perhaps one of the bee killers but please wait for the opinion of a more knowledgeable member.

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