Additional Data on Victims of Parasitic Cowbirds

SxNc• the last compilation of hosts of cowbirds (Auk, 1943: 350-356), a number of additions have come to my attention, some in publications and some by way of personal correspondence. No attempt has been made to re-identify any of the old records in light of the changes in racial forms recognized in the various supplements to the last A. O. U. Check-List; that may well wait until the 5th edition of the Check-List is published. As might be expected, the present additions to the list of birds known to be parasitized by cowbirds make no very important alterations in the general, overall picture, but they are of interest in themselves as bearing on the interrelations between the economy of the parasite and of each particular host species. In the following annotated lists are discussed not only those birds new to the roster of victims but also a few others on which important new data have been gathered.