PREFACE. Xi 
scribed ; he therefore placed them in the genera to which they ap- 
peared to have the most numerous approximations in character. 
But had he been acquainted with their modes of life, it cannot be 
doubted that he would have further subdivided them into genera, 
which I think is well exemplified by the various alterations that he 
actually made in his nomenclature, on the appearance of each suc- 
cessive edition of the “Systema Nature.” 
In the preceding pages I have stated that I found great difficulties 
in procuring some of the works required for the purpose of exami- 
nation. The following remarks are entirely occasioned by my in- 
ability to procure a sight of the work of Keyserling and Blasius, 
and from the want of learning the date of the publication of Koch, 
until my work had nearly passed through the press. 
Page 5. Add to Pernis and Milvus the synonym of Aquila, Koch. 
Page 7. Before Scops it is necessary to place EpH1aLtes, Keys. 
et Bl. (1840), as the former was previously employed by Mcehring 
to another bird. 
Page 8. Add among the synonyms of Otus, A’golius, Keys. et Bl. 
(1840). 
Page 28. To Acrocephalus add Muscipeta, Koch (1816). To 
Phyllopneuste add Ficedula, Koch (1816). 
Page 29. To Luscinia add Lusciola, Keys. et Bl. (1840). To 
Ruticilla add Saxicola, Koch. ‘To Cyanecula add Saxicola, Koch 
(1816). To Calliope add Lusciola, div. C. Melodes, Keys. e¢ Bl. 
(1840). 
Near these genera may be added, Ipuna, Keys. et Bl. (1840). 
Motacilla, Pall. Sylvia, Licht. I. caligata, (Licht.) Keys. e¢ Bl. 
M. salicaria, Pall. 
Page 30. Fruticicola must give place to Pratincola, Koch (1816). 
Page 31. Aigithalus must have before it the generic name of 
Paroipes, Koch (1816). 
Page 32. Calamophilus must be removed for Panurus, Koch 
(1816) ; and Mystacinus was first proposed by Bote (1822). Orites, 
place after Leach, Steph. (1825), and add the synonym of Acre- 
dula, Koch (1816). 
