New Canaan, a wealthy town in Connecticut, is a town of lawns. Lawns, trim and bug-free, lined with sculpted shrubs. Lawns, like so many lawns across suburban America, sprayed with pesticides each spring, mowed each week of summer and raked free of leaves each fall. But Bill and Mary-Ellen McDonald have taken a different approach. “These fireflies are here, and really only here,” Mr. McDonald, 75, said on a recent Friday evening, the sky fading to lilac.

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Persons: Bill, Mary, Ellen McDonald, ” Mr, McDonald Locations: Canaan, Connecticut, America