Broadhead planarian (so mad I couldn't get a shot of its cool head shape) in a moist (recently flooded), meadowy valley. My best guess is Bipalium pennsylvanicum. Bipalium kewense is my second-best guess. Waiting on some input from experts, but I'm going with the first for now!
''Bipalium kewense'' is a species of large predatory land planarian with a cosmopolitan distribution. It is sometimes referred to as a "hammerhead flatworm" due to its half-moon-shaped head, but this name is also used to refer to other species in the subfamily Bipaliinae.