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dear Arp,
do you know my three databases? Feed in https://sdei.senckenberg.de , select and click on the World Agromyzidae database, feed in the species field flavifrons and in the genus field Amauromyza and you will receive the world literature on this species on 16 scanned file cards. Search for all its synonyms by feeding in flavifrons in the last field and search each of those names and you will receive many more references for the synoyms.
Michael von Tschirnhausn