These are growing in my yard. Shall I attempt to rear them? And if so, any suggestions?

if they haven't already. Rearing midges with this aspect to their life cycle is tricky, and I haven't succeeded yet. If you wanted to try, you'd have to give them some soil (a somewhat moist sand/peat mixture) to burrow into, and then Dr. Gagne recommends putting their open-topped container (like maybe a small flower pot) into a shoebox with a clear, snugly fitting vial sticking out of it. You would place this closed box in an unheated place, like a porch or garage, to overwinter, near a window. This way the larvae will experience seasonal temperature changes, and when adults emerge from the soil the following spring, they will fly into the vial because that is the only place light is getting into the box.