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On a Impatiens sp. plant. 23th September, 2017.

Body size about 2 mm.

Regards,

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Could be a Scaptomyza. The only one that supposedly has a wing spot in the female is S. adusta, a Nearctic species introduced in the Mediterranean.

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Quoting the description of Scaptomyza adusta in an American reference:

The males and females of this slender, light brownish-gray, medium-sized species look similar. The thorax displays two light longitudinal bands that flank a darker dorsal midline. The abdominal pigmentation pattern is usually dull. The wings display one apical wing spot. The maxillary palpi are light. Two ventral branches exist below the fork of the arista (not counting the fork). The thorax has four rows of acrostichal bristles and one prominent humeral bristle. The ratio of apical to basal scutellar bristle length is 2/3. The apical scutellar bristles are crossed and stand at a higher angle than the basal scutellar bristles. Similar species: S. terminalis has two prominent humeral bristles but looks otherwise identical. Tips for collecting and breeding: The flies of this species can be reared or collected with a net from skunk cabbage.

https://digitalco...oabooks/1/

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The fly has apparently only two rows of acrostichals, which would indicate S. okadai (known from Japan nd Russian Primorye). In order to determine it safely, specimens should be seen (especially male).

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On the second picture there are some clear acrostichal setae in the pale area between the median acrostichal setae and the dorsocentral setae...

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Then yes, adusta would fit well. But I do not think that two setae each side in the foremost part of mesonotum can be considered a "row". Anyway, specimens are desirable.

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That goes without saying.

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Very interesting discussion. I think I'll name it Scaptomyza cf. adusta for precaution. Thanks to everybody.