Antioch Robber Fly (Cophura hurdi)
The Antioch Robber Fly was described in 1960, it is obviously known only from a single specimen that had been collected in 1939 in the Antioch Dunes in Conta Costa County, California, USA.
The species reached a size of about 0,7 cm and was pale brown. [1]
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References:
[1] Frank M. Hull: New species of Syrphidae and Asilidae (Diptera). The Pan-Pacific Entomologist 36(2): 69-74. 1960
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edited: 21.01.2019