Good call Richard; I was a little hesitant to move them since these specimens have more yellow than usual, but the location and dark brown wings give away the species.

Moved from Mischocyttarus flavitarsis.

Thanks to George Waldren, this previously unrecognized species has its own page in BG.
Based on his comment on Margarethe's photographs from same state, one can safely assume this colony was one of M. navajo too.
Now, these too pictures should be moved to their right place by someone with editor status.