Larviform adult female makes for a pretty distinctive looking beetle, and seems to agree well with the discussion of Microphotus angustus in Evans & Hougue(1).

A technical detail that's nagging me though: Evans & Hogue(1) state that adult females have 7 abdominal segments visible from below, and it seems to me there are 8 here. (Maybe the eighth segment is visible here because the larva in curling its body?) Both your specimen and the one pictured here have 8 abdominal segments when viewed from above.

Just for interests sake, I noticed Evans & Hougue(1) also state that larvae have 10 abdominal segments, appearing 9 segmented from above...which jibes well with the top three images here. I guess what's going on for Microphotus (in adults and larvae) is that the third thoracic segment projects rather far back below, generally covering the first abdominal segment. (BTW, the last photo in the previous link shows well the "large eyes" of the male, visible from below.)