Need ID -- anyone know? The only specimen I saw. Fairly small (~2.5 cm long?) Near roadside ditch in swamp/pine barrens border habitat.

Rambur Forktail (Ischnura ramburii) has similar pattern on the end of the abdomen, but not more proximally; however, greenish thorax looks good. Perhaps Pine Barrens Bluet (Enallagma recurvatum)? Abdominal pattern looks exactly right, including the black lateral mark on S8, except that S9 is dark rather than light. However, this is a bit past recorded flight season (5/8-6/27). New England Bluet is similar, but range & habitat are wrong.