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Oh, I see. Insects don't have pupils like we do. The black spot is a kind of optical illusion, compound eyes are made of many tube like parts, each one like a small tube, those that are aligned with the camera and therefore not reflecting any light appear dark. Since, we humans are particularly well tuned to detecting the pupil of the eye, interpret this circular black area as a pupil.

Furthermore, myself included before I realized this, we think of all eyes as spheres. In reality the insect eye is like a thick mat, placed over a dome. The mat is made of many small tubes placed next to each other, lens at one end, retina and nerve endings at the other, this is then bend over a dome like structure to give the roundness of the eye.

Amazing! Thank you for the clarification! 8)
Never before have I thought that insects are so complicated. But this explains why their eyes have a reticular structure in macro photography 8))