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Hello Benoit,

If this were Sapromyza quadripunctata, the it should have strong ocellar setae that are placed just beside the ocellar triangle. From the blow-up I made of the pictures it does not seem to be the case in this specimen. This specimen is a male (from the appearance of the tip of the abdomen) and in S. quadripunctata both the hind femur and hind tibia have strong additional setae. These are absent in this specimen as well. So, no S. quadripunctata here.

Following the keys, this specimen either belongs to S. opaca or S. zetterstedti. Unfortunately, the character that used to be given to separate these two, the number of black spots on the abdomen is not constant. Four spots used to be S. zetterstedti and six spots S. opaca and S. sexpunctata. The last one has a shining mesonotum and can be ruled out. The other two can only be separated with certainty on the basis of the genitalia. So, if someone says that it is S. opaca, I cannot say it is incorrect.

Paul