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Timarcha sp.
Black beetle, about 1,5 cm in length
Nature park Velebit, found on rock
Timarcha is a difficult genus, with a lot of very similar, poorly-defined species on the Balkan Peninsula, whose distribution is poorly understood. Some of them may turn out to be synonyms in future. For your beetle here, the possibilities are: T. goettingensis, T. pratensis, T. durmitoriensis, T. stepaneki and T. montana. I think that T. goettingensis is most likely, because of the relatively fine elytral sculpture, but I can't be sure.
Thanks, Michael! I IDed this beetle as genus, it's unable for me to find the species :)