APR 21 1920 
SUPPLEMENT 
TO THE 
eo 
BI Be Sy OE. bt) Ne 
PREFACE. 
the three years that have passed since the publication of the 
ls of Devon’ attention has been largely directed to the 
s, some of it sent directly to the Authors ; while they have 
aselves been able to add from time to time to their own 
f , ( ks to be added to those that are known to nest upon the 
B 
