Another pool victim. It's about 15mm long.
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At first glance, it looks like a
Cyclocephala, but I'm pretty sure it isn't. This is a group known as the masked chafers in the subfamily Dynastinae of Scarabaeidae. The dynastine scarabs are some of the largest and can reach 160 mm.
The more I look, the less convinced I am of my first impression. I'm not seeing some of the key characteristics of that group, though obviously difficult with photographs at times. No way to manipulate it, for instance, to get a better angle or change the glare to let it help define some of the characters. I'm buying some excuse, but your fauna is completely alien to me in many respects and what may be common to you, is brand new and unfamiliar to me. That makes it an interesting challenge.
I'm pretty sure it is not
Scarabaeus omnisciencis or
Scarabaeus circularis rationatus or anything else I can make up.