Start thread at rear of hook and dub the lower body to the center of the hook. Tie in hackle for legs. Dub the forward section to but not covering the eye. Palmer the hackle between the 2 body sections. While ants have three sections to their bodies, the 2 section fly seems to work better.
Whip finish the head.
Trim the hackle on the underside close for a lower ride in the water. No waiting around for the hatch. Fish them early, mid-day, afternoon or evening. The ant is one type of insect that is always there - except below freezing. And I have seen ants scurry across melting snow.