Moved from Nepticulidae.

The moths in these images are Elachista sp. (Elachistidae). The commonest of the metallic-banded Elachista species in Illinois is E. madarella, the larva of which is a leaf miner on sedges of the genus Carex. There are a few other metallic-banded Elachista species in Illinois, but they are not nearly so noticeably common as is E. madarella; so, that very probably is the identity of the moths in these photos. The earlier suggestion of Nepticulidae has to be ruled out, by the way, because the moths in your photos clearly have smooth, shiny-metallic, slicked-down scaling on the head. In Nepticulidae, the head bears a very prominent tuft of upright, hairlike scales that renders the appearance of the head fuzzy or shaggy, rather than smooth and shiny.

Moved from Moths.

I showed these pictures to someone who rears leaf miners, and he said they were Nepticulidae (at least the main pic). They are nearly impossible to identify without knowing the host plants or mining habits. Besides that, many are undescribed. I've tagged this under the family until over-ruled.