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Well, if you can confirm that the tips of the palpi are darkened that might be possible, but I thought I saw all yellow palpi. If black and using Nartshuk & Fedoseeva (2011), triangulina would fit. Fauna Ent, Scand mentions the lateral margins of the frontal trangle to be darkened, but that eludes me in your pictures. However, the genae do have scattered hairs.