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Hi Susan,

Indeed a Tephritid, and also a Terellia, subgenus Cerajocera, but not the species ceratocera. It is Terellia (Cerajocera) tussilaginis. This species is easily identiefied within this (sub)genus, for it has three bands on the wing, with a fourth spot at the basis (not really a band), furthermore in the males it has no modified antennae, contrary to T. (C.) ceratocera, in which the male has an extension on the second antennal segment. The photographed specimen is a male, with no modified antenna and therefore tussilaginis. The larvae feed inside flowerheads of several Arctium species.

Cheers,

John