Circus hudsonius. Bethel, Maine. Marsh Hawk chases a bird. 1907 July 18-22 About 9 A.M. of July 20 I saw a fine adult male Marsh Hawk cross the wide open field at the rear of the Doctor's house in hot pursuit of a much smaller bird. What the latter was I could not determine for it doubled and twisted so that its manner of flight gave me no clue and the sun so dazzled my eyes that I was unable to make out its coloring which, however, appeared to be nearly uniform and rather dark. At first I took the bird to be a Flicker but just as it reached the woods and glided smoothly and swiftly on set wings for a few yards before disappearing among the foliage of a big balsam it looked and acted more like a male Sharp- shinned Hawk. Whatever it was the Marsh Hawk gave it a sharp chase and, no doubt, something of a fright. When I first noticed him he was about one hundred yards distant from me and perhaps fifty feet from the smaller bird. Flying at a height of some twenty feet above the ground - which here sloped gently downward towards the woods - and lashing the air vigorously and ceaselessly with his long pointed wings he moved with surprising swiftness for a Circus and soon overtook the object of his pursuit. Of course I expected a tragedy - and watched for it breathlessly, but nothing of the kind happened although the Marsh Hawk seemed repeatedly to enfold the smaller bird in his great wings so that it was quite lost to my sight for an instant and more than once to strike it so forcibly with his breast (as I thought, although he may have used his bill) as to almost overturn it. That he did not once grasp nor even