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tristram is correct ... when you see a bracketed generic name between the genus and species names then it is a sub-genus.

It usually signifies that taxonomy has changed to 'lump' several small genera into 1 large genus but authors choose to retain some link back to the original taxonomy because it has merit as a form of sub classification.

In Sarcophaga the old genera (eg. Heteronychia) are often quoted as sub-genera but this is not compulsory - some people like to see subgenus and others hate it