vi PREFACE 



within brackets. The bill measurements, unless otherwise 

 stated, are from the level of the end of the frontal feathers 

 in a straight line to the tip of the bill, i.e., in a curved bill, 

 like a Falcon's, the measurement is not that of the chord 

 of the curve. Measurements are in millimetres, and for the 

 convenience of those who are not familiar with the metric 

 system it may be said that twenty-five millimetres are 

 practically equal to one inch. 



The systematic arrangement followed is that of Hartert's 

 work previously mentioned, but Colonel Wardlaw Ramsay 

 did not adopt Hartert's nomenclature in all cases. 



WM. EAGLE CLARKE, 



