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Hi David.
1. It is exatly what I meaned - species level ID of Agromyzidae, using key edited in 1970, has to be doubtfull.
2. On the other hand all description is absolutly for C. lateralis. For example, C. affinis has yellow scutellum and black abdomen with narrow yellow rings (C. laterralis - black, grey dusted thorax and scutellum, yellow abdomen with wide black rings, more wide in dorsal part).
Nikita