This researcher would like assistance with locating a ground nesting colony of Andrena bees.  (Stylopized bees are parasitized bees).  If you have seen any ground nesting bees, please respond to this web.  Your help is greatly appreciated.  I think he would like the locations to be in the Vancouver region of BC. 

Check out the two links below for beautiful photos of various bee species and stylopized bees.

Hello Dr. Margriet Dogterom,
This year I embarked on an project involving the signalling in Strepsipteran parasites of Polistes wasps. Next spring we would like to expand our research to Andrena bees. Ideally, we need to locate large aggregations to provide a ready supply of stylopized bees. We found one large aggregation that turned out to be Colletes, and another that is not very accessible (It’s on a city boulevard).

Ideally we need to locate colonies before emergence next spring, as the stylopized bees emerge first. Would you happen to know the whereabouts of any Andrena bee aggregations? 
Thank you,
Mike

Photos of stylopized bees

Photos of mason bees and other bees

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