(Butterfly) by the Butterfly House in Faust Park in Chesterfield, St. Louis County, MO. MO340 (Olive Blvd) NE 1.2 miles from jct with I64 exit 19 to the parking lot on the NW side of the road. (N38 39.895 W90 32.543) Photo by Jack & June Schmidt 8-28-10.