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Eumerus sp.
Small black/brown arthropod pollinating a white rose hybrid.
Spotted near entrance to Frontierland at Disneyland, California. There is a large pond and trees in this area as well as small plants and flowers including these roses.
I believe this is a male hoverfly from the Eumerus genus. Unfortunately I don't know the species.
Thanks for the suggestion, it looks like this post on BugGuide:
http://bugguide.net/node/view/505927