INTEODUCTION. i 87 
lively song, and he has not his equal. As before, however, 
the birds that approach nearest the fishes are rightfully 
placed the lowest (Penguins, Grebes, Divers, etc.). 
In writing the present catalogue I have received much 
assistance from the excellent list of Dr. Eliot Coues ; also 
from the very complete list of Mr. J. A. Allen, to whom I 
express my sincere thanks for other services. I am also 
under obligations, for valuable information, to Mr, William 
Brewster, of Cambridge; Professor S. F. Baird, of the 
Smithsonian Institution; Mr. H. B. Farley, of Chelsea; 
Mr. E. L. Weeks, of Newtonville ; Mr. J. F. Le Baron, of 
Ipswich; and especially to Mr. Henry A. Purdie, of West 
Newton, for valuable notes concerning the time of migra- 
tion, etc. 
In giving the time of migration, I have taken the aver- 
age for many years, or the earliest or latest date observed 
during a similar period. 
All information that I have received has been accredited 
to the individuals who have given it. The occurrence of 
all other birds, or notes upon them, I have given upon my 
own authority. When facts about some particular species 
are well known, having been published before, I have not 
repeated them. 
G. J, M. 
Newtonville, September 20, 1869. 
