Usually not more than a single Cowbird’s egg is found in the same nest, though it is not uncommon to find two; and in a few instances three and even four eggs have been met with. In one instance Mr. Trippe mentions having found in the nest of a Black and White Creeper, besides three eggs of the owner of the nest, no less than five of the parasite. Mr. H. S. Rodney reports having found, in Potsdam, N. Y., May 15, 1868, a nest of _Zonotrichia leucophrys_ of two stories, in one of which was buried a Cowbird’s egg, and in the upper there were two more of the same, with three eggs of the rightful owners. In the spring of 1869 the same gentleman found a nest of the _Sayornis fuscus_ with three Cowbird’s eggs and three of her own. Mr. Vickary, of Lynn, found, in the spring of 1860, the nest of a _Seiurus aurocapillus_, in which, with only one egg of the rightful owner, there were no less than four of the Cowbird. All five eggs were perfectly fresh, and had not been set upon. In the summer of the preceding year the same gentleman found a nest of the Red-eyed Vireo containing three eggs of the Vireo and four of the Cow Blackbird. How the offspring from these eggs may all fare when more than one of these voracious nurslings are hatched in the same nest, is an interesting problem, well worthy the attention of some patiently inquiring naturalist to solve. The Cow Blackbird appears in New England with a varying degree of promptness, sometimes as early as the latter part of March, and as frequently not until the middle of April. Nuttall states that none are seen in Massachusetts after the middle of June until the following October, and Allen, that they are there all the summer. My own observations do not correspond with the statement of either of these gentlemen. They certainly do become quite rare in the eastern part of that State after the third week in June, but that all the females are not gone is proved by the constant finding of freshly laid eggs up to July 1. I have never been able to find a Cow Blackbird in Eastern Massachusetts between the first of July and the middle of September. This I attribute to the absence of sufficient food. In the Cambridge marshes they remain until all the seeds have been consumed, and only reappear when the new crop is edible. This Blackbird is a general feeder, eating insects, apparently in preference, and wild seed. They derive their name of Cow Blackbird from their keeping about that animal, and finding, either from her parasitic insects or her droppings, opportunities for food. They feed on the ground, and occasionally scratch for insects. At the South, to a limited extent, they frequent the rice-fields in company with the Redwinged Blackbird.