Definitely a wasp, not a midge, and the pupa looks like a wasp too. That big flat thing could be some sort of larva that was parasitized.

yeah, looked around you guys are pointing me in the right direction I think. Didn't see ones on here that look quite the same. This one is 1mm or slightly less. Not sure if that helps.

Now I'm curious about this possibly parasitized larva!

Gagne (1) doesn't list any midges with this plant as a host. Do you have any shots of what the leaf looked like before you opened it? Was it like this by any chance? This image shows what look to me like leaf mines, and I could imagine this dead larva being a gracillariid or something like that.

The parasitized larva belongs to a leaf-mining moth in Gracillariidae. The wasp is in Eulophidae. It looks to be close to Cirrospilus, but I'm not sure.

This is an awesome set of images and its great to have so many helpful people to solve the mystery :)

It would be interesting if you were able to rear out the moth larvae next time you find mines like this. The only gracillariid listed in the HOSTS database as feeding on Canavalia is Phodoryctis caerulea, which is found in Fiji and East Africa.

This has been a really interesting investigation for me. I will try to find some moth larva that hasn't been parasitized yet. I'm currently in my first foray into larva rearing with another mystery moth. So maybe that'll be my next project!