Much of the technical excellence of these plates in due to the fine specimens of birds furnished the artist through the courtesy of the American Museum of Natural History, New York City. In this connection both illustrator and author wish to thank Dr. J. A. Allen and Mr. Frank M. Chapman of the department of ornithology in that institution.

The numerals on the plates indicate the approximate length of each bird, small fractions being avoided. The point of measurement being from the tip of beak over the back to the end of the tail, it must be remembered that this length is often variable according to the development of the tail.