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PREFACE.

increased to eleven.” Desirous, if possible, of extending our knowledge of an interesting group
of birds, with which we were so little acquainted, | have from that period until the present
moment been unremitting im my exertions to secure every information attainable respecting
them. In the course of my researches I have several times visited most of the public and
many of the private collections of Europe, and have besides corresponded with various persons
in America: the result is that I have had the pleasure of extending our knowledge of the
group from eleven to no less than thirty-five species ; doubtless others remain to be
discovered, for it is not to be presumed that the vast forests and tracts of barren land of the
great Andean and Cordillerean ranges have as yet been so far explored as to have revealed to

us every species; but herein I have described or figured all with which I am acquainted.

In the Introduction will be found some additional information obtained since the subse-
quent pages were printed, and also descriptions of three species which I have not thought

it necessary to figure.

shall at all times be happy to receive further information trom any person who may be

favourably situ: See ae
avourably situated fox observation, and who wil] kindly favour me with the result of his

researches,

JOHN GOULD.
October 15, 1850.