Vol. XVII PALMER, The Maryland Vellow-throat. 223 
1900 
Comparative Areas of the Habitats. 
The following figures are only approximate, but are well within 
the truth. They illustrate only the breeding range of the respec- 
tive forms. 
East of the Appalachians, 1000 X 150 miles = 150,000 square miles, plus 
Mississippi Valley area, 800 X 700 miles = 560,000 square miles. Total, 
710,000 square miles. General elevation, 50 to 1000 feet. ; trichas. 
A coastwise strip about 2,000 X 25 miles 50,000 square miles. Gen- 
eral elevation, less than 50 feet . : : F : F : roscoe. 
Practically an area 600 X 500 miles = 300,000 square miles. General 
elevation, northern sea level to 1,000 feet : , : brachidactyla. 
An area 1200 X 1200 miles = 1,440,000 square miles. General elevation, 
almost entirely above 2,000 feet .  . —. : : . occidentalis. 
Area and elevation not known . : : : : : melanops. 
The areas here given total 2,500,000 out of the 3,500,000 square 
miles of southern British America and the United States. Con- 
trasted with this immense area, with but four forms of frichas and 
four other species, we have in Central America, with but 950,000 
square miles, at least 17 forms; an instance of the greater 
wealth of a tropical habitat. 
The extension of the range of roscoe to Chesapeake Bay is 
based on my collection of the bird (June 1896—7-9) in the Dis- 
mal Swamp, where it is quite abundant in the cane (Arundinaria 
tecta and macrosperma) and the cypress (Zaxodium distichum). 
In 1898 Mr. R. G. Paine, at my request, sought for Yellow-throats 
in the vicinity of Charleston, South Carolina. He found two, 
and took a specimen on November 1 in St. Andrew’s Parish. It 
is an immature voscoe. Wilson has the following to say, undoubt- 
edly of this bird:* “I found several of them round Wilmington, 
North Carolina, in the month of January [1809] along the margin 
of the river, and by the cypress swamp on the opposite side.” It 
is doubtful if this form occurs far from the coast, certainly not 
above the roo-foot contour. 
A specimen is in the Biological Survey collection taken by Wm. 
1 Am. Omn., II, 1810, 163. 
