Chalk-fronted Corporal: Day Brook Pond, Kennebunk Plains Wildlife Management Area, Kennebunk, Maine, USA — The Chalk-fronted Corporal is among the first dragonflies to take wing in any number in Southern Maine. Day Brook Pond had its share yesterday already. Nikon B700 at 1100-1440mm equivalent. Program mode. -.3EV. The white pruinosity (the chalk-like coating on the throax) really sets off the hydraulics at the base of the wing. All those tiny pumps allow the dragonfly to move and shape each wing, and each segment of wing, independently…giving them an amazing agility in flight.