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Update: I'd been looking for several weeks for the original description, and the day I inquire on this forum, I find it.

For anyone interested:
Felt EP (1916) New North American gall midges (Dipt.). Entomol News 27(8): 412-417.

I'm not able to find specimens in digitized collections, and would appreciate it if anyone has a suggestion for where I should begin searching. I'd still greatly appreciate a point of contact for Dasineura.