Circus hudsonius. Bethel, Maine. Marsh Hawk chases a bird. 1907 July 18-22 (2) clutch at it with his talons I was very certain. That he could have seized and held it with ease and certainty seemed perfectly obvious. No doubt he was merely playing with or perhaps bullying it, as Hawks of various species are prone to do when not hungry, not only when it pleases them to frighten some of the defenceless creatures on which they prey but also when dealing with smaller and weaker birds of their own kind which perhaps anger them by poaching on their chosen preserves. While the two birds above referred to were in close contact they performed the most rapid and intricate evolutions, turning and twisting incessantly, now rising fifty feet into the air, next swooping down nearly to the tips of the waving grasses. They sep- arated before reaching the woods but the Marsh Hawk did not give over the pursuit until he was nearly lost to my sight among the trees. Then he turned back and proceeded to beat the field in the leisurely, graceful way characteristic of his kind. When I saw him last he was floating off to leeward over some thickets, driven like a tuft of thistle down before the strong northwest wind.