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Yes, it is likely sylvanus. Doubts, however, have I not been in Primorye and venatus in nature is unknown to me.
Got it. I meant tentative ID would be better. :) Or it's the genus with only one species in the Philippines (can't check right now); however there are also Telicota and other similar. Imho, the group is quite tough.
I'm quite far from being a Zygaenidae expert, anyway I believe Igor is absolutely right. This is male in the photo. If my sclerosis doesn't fool me, pruni has yellow (reduced) proboscis whilst other "greens" don't. Seems yellow here. Plus pruni is rather to be blue than green, what we also can see. :)
Imho, those who think it's really easy to differ these two Aricia, see the world through pink glasses. :) Sure, there are obvious cases, but to deal with our Kharkov butterflies, I can't clear it up without "rocket artillery" (which I hope some day I'll finally get in use :) Tough case... :) Anyway, as to this specimen, I'd rather lean to Sergey, not surely though. I'd move it to uncertain.
Everything is possible in theory... Even bear happens to fly... :) At least two things are confusing here: first, it was never noticed in the Black Sea Coast as against well-known migrants such as L. boeticus and L. pirithous, not to mention even more northern regions (please correct me If I'm ignorant), second, is this really Ch. galba? Similar to some extent, far from being sure though.
With a group of adippe-like (ie, subgenus Fabriciana) there really is chaos and chaos, but it now seems to be not the case. :)
Without a question mark, perhaps. Reassurance, just in case (just checked there are no other species of this genus in Thailand). :)
Judging by images in Efetov's book, this is I. hyalina. The book is available here: http://www.lepidoptera.crimea.ua/articles/Efetov_2005_Zygaenidae_Crimea.djvu. Yet I'm far from talking professionally as for this case.
PS: I put together a few years ago between a few pieces and Peresechnoy Solonitsevka. Atalia and showed Britomartis. They fly in the same habitats. Atalia ranshe little bit, but basically overlaps years. A couple Britomartis / Aurelius somehow can be distinguished by their appearance by Atal (and even then, there are contentious cases), but from each other, I would not venture.Males of all three ...
I think it's still Britomartis - of those edges (Solonitsevka-Peresechnaya) it reliably known (determined from the genitals). Aurelius of the Kharkiv region was significantly not yet known (and indeed its discovery we have quite unlikely). Appearance can be deceptive here. But if this specimen collected - you can find out for sure.I can cook it. :)