I continued to check on the mating mantids throughout the day yesterday, and by the time I went to bed, they still all looked to be in the same position as they had been all day. All 2½
of them.

First thing this morning, when I checked them, the ½ male, my formerly one-eyed little friend was gone. Nothing remained but a few bits of wing on the cage floor. The other male is still intact. Still clinging to the female, but not actually mating.