Triangular Double-hump Spider

Size about 12mm. This species reminds of Leucauge genus. Its thorax is flat while the abdomen looks triangular, standing on its side with two bumps at the top near its thorax. There is also some yellow colouration visible in some specimens. I could not find a proper identification for this species. Since I found it several times and it looks similar quite consistently, I'll separate them into a gallery of their own for now.