VI PEEFACE. 



had to thank him for the loan of niost valuable unique specimens (types of species), 

 as will be duly acknowledged in our descriptions of the species concerned. To another 

 distinguished naturalist of the Natural History Museum of Paris, Dr. Emile Oustalet, 

 we have also to express our thanks for information kindly given. 



Count Salvadori, though we have not been supplied with specimens from Turin, has 

 given us personally very valuable aid and advice, in addition to the inestimable assistance 

 of his Catalogue above referred to. Dr. R. Gestro, of Genoa, has merited our special 

 thanks for the amiable readiness with which he has, on two occasions, sent us precious 

 specimens for study and delineation, including a very beautiful as well as unique typical 

 specimen. Dr. Martorelli, of Milan, Dr. Biittikofer, of Leyden, and Dr. A. B. Meyer, 

 of Dresden,- have been so good as to have figures drawn and coloured, under their 

 personal supervision, so as to furnish us with accurate representations of specimens which 

 the rules of the Institutions to which they are severally attached did not allow them 

 actually to lend. 



To Dr. A. B. Meyer we have also to give our thanks for forwarding us three specimens, 

 and similar acknowledgments are due to Dr. Kraepelin, of Hamburg, and especially to 

 Dr. Ludwig Lorenz, of the Imperial Museum of Natural History at Vienna, for the most 

 valuable typical specimen of an otherwise unknown species. 



In our own country we have also met with similar kindness, and we have especially 

 to express our gratitude to the Rev. Canon Tristram and to the Hon. Walter Rothschild for 

 the very ready kindness with which very valuable specimens (not otherwise to be obtained 

 by us) have been by them confided to our care. 



To Dr. R. Bowdler Sharpe we have to avow singular obligations. In spite of his 

 multitudinous and onerous duties, and the almost incessant calls upon his time, not only have 

 the fruits of his ripe knowledge and vast experience been placed at our disposition, but 

 each one of our Plates has been carefully compared by him with the specimen represented, 

 so as to ensure its fidelity to nature. 



