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I don't know, i can't see any spot on T2-3 (not before T5), but i was wondering if it could be du to alcohol.
What do you think i should look on for more argument?

I have another specimen from the same horse witch correspond exactly to this one except it hasn't 2-3 constriction on the first antennal segment. (only one constriction. Same length for the first antennal segment). I think it's the same specie, so if you wonder something about the variation, i can check on that one. (but no spot before T5 either)