Anax guttatus (Burmeister, 1839)
Anax panybeus Hagen, 1867
Gynacantha basiguttata Selys, 1882
Gynacantha bayadera Selys, 1891
Gynacantha subinterrupta Rambur, 1842
To my own judgement, these larvae do not seem to be Anax species. Therefore, they could be one of those Gynacantha species. I am not good at larva identification. Anyway, I caught a few of them for rearing in hope to get the correct identification.