Sir John Richardson found these birds very numerous in the interior of the fur countries, ranging in summer as far to the north as the 58th parallel, but not found to the eastward of Lake Winnipeg. They reached the Saskatchewan by the 20th of May, in greater numbers than the Redwings. Through California, as well as in the interior, Mr. Ridgway found the Yellow-headed Blackbird a very abundant species, even exceeding in numbers the _A. phœniceus_, occurring in the marshes filled with rushes. This species he found more gregarious than the Redwing, and frequently their nests almost filled the rushes of their breeding-places. Its notes he describes as harsher than those of any other bird he is acquainted with. Yet they are by no means disagreeable, while frequently their attempts at a song were really amusing. Their usual note is a deep _cluck_, similar to that of most Blackbirds, but of a rather deeper tone. In its movements upon the ground its gait is firm and graceful, and it may frequently be seen walking about over the grassy flats, in small companies, in a manner similar to the Cow Blackbird, which, in its movements, it greatly resembles. It nests in the sloughs, among the _tulé_, and the maximum number of its eggs is four. Mr. W. J. McLaughlin of Centralia, Kansas, writes (American Naturalist, III, p. 493) that these birds arrive in that region about the first of May, and all disappear about the 10th of June. He does not think that any breed there. During their stay they make themselves very valuable to the farmers by destroying the swarms of young grasshoppers. On the writer’s land the grasshoppers had deposited their eggs by the million. As they began to hatch, the Yellow-heads found them out, and a flock of about two hundred attended about two acres each day, roving over the entire lot as wild pigeons feed, the rear ones flying to the front as the insects were devoured. Mr. Clark met with these birds at New Leon, Mexico. They were always in flocks, mingled with two or three of its congeneric species. They were found more abundant near the coast than in the interior. There was a roost of these birds on an island in a lagoon near Fort Brown. Between sunset and dark these birds could be seen coming from all quarters. For about an hour they kept up a constant chattering and changing of place. Another similar roost was on an island near the mouth of the Rio Grande. Dr. Kennerly found them very common near Janos and also near Santa Cruz, in Sonora. At the former place they were seen in the month of April in large flocks. He describes them as quite domestic in their habits, preferring the immediate vicinity of the houses, often feeding with the domestic fowls in the yards.