INTKODUCXION. XI 



described by him, and this series has been of material use to me. 

 I have also examined the collection in the University of Cambridge 

 and that of Canon Tristram, both helping to elucidate points of 

 interest. 



Dr. Elliott Coues's papers on the FroceUariidd', ])ublishtd in the 

 Proceedings of the Academy of Natural Sciences, Philadelphia, in 

 1864 and 1866, give the first serious attempt to classify these birds 

 Avith proper definitions ; Bonaparte's previous essays in 1855 and 

 1856 being of a cursory character and often misleading. Dr. Coues's 

 Monographs, though perhaps too much influenced by Bonaparte's 

 writings, must always be consulted by those wishing to master the 

 intricacies of this complicated subject. 



OSBERT SALVIX. 



Hawksfold, Fernburst, Sussex, 

 November 3, 1895. 



