2 I 8 Brewster on Helm in thoph aga leucobronchialis. 
found together on the coast up to the last of the migration 
would seem to imply that their breeding ranges cannot be far 
separated. It may be ascertained that typical clarkii , with its 
small size and weak bill, only occurs in summer well up on the 
North-west Coast, and that the coast districts of California, Oregon, 
and perhaps Washington Territory furnish the intermediate 
specimens. 
ON THE RELATIONSHIP OF HELMINTHOPHAGA 
LEUCOBRONCHIALIS , BREWSTER, AND HEL- 
MINTHOPHAGA LA WHENCE I, HERRICK; WITH 
SOME CONJECTURES RESPECTING CERTAIN OTH- 
ER NORTH AMERICAN BIRDS. 
BY WILLIAM BREWSTER. 
Since my original description of the White-throated Warbler 
( Helminthophaga leucobronchialis ) appeared, specimens have 
slowly multiplied until, including the two announced by Dr. 
Fisher in the present number of the Bulletin,* there are now no 
less than twelve known examples. Until recently there has been 
no apparent reason for doubting the validity of the species, which 
has been generally accepted, and even heartily endorsed by sev- 
eral prominent ornithologists. But not long since Dr. Edgar A. 
Mearns and Mr. Eugene P. Bicknell sent me some puzzling 
specimens which, at the time, I was obliged to consider aberrant 
individuals of H. pinus and H. chrysoptera , but which never- 
theless raised certain suspicions affecting H leucobrojichialis and 
IP. lawrencei. These suspicions are now confirmed by the 
examination of a fine series, belonging to Dr. A. K. Fisher, 
which throws a flood of light on the whole subject. I am in- 
debted to Dr. Fisher’s kindness for permission to make use of this 
material in the present investigation. 
Before entering into the details of the evidence before me it 
may be well to emphasize some of the prominent characters 
which respectively distinguish H pinus , H. chrysoptera , II. 
leucobronchialis , and H. lazvrencei. 
[* See beyond, under “ General Notes.” — E dd.] 
