Brewster on a Petrel new to North America. 
95 
of nearly pure plumbeous. Around this colored tract there is nowhere a defi- 
nite line of demarcation : the cinereous of the neck fades imperceptibly into 
the white of the throat, and the edges of the abdominal bar become mingled 
with white, until the dark color is entirely lost along the sides under the 
wings, and at the beginning of the under tail coverts ; while forward, on 
the lower part of the breast, and over the ventral region generally, the 
feathers are spotted, barred, or finely vermiculated, in varying shades of 
color. The sides of the head backward to behind the eye (where the 
band of color already described begins), are essentially white, but the 
feathers immediately below the eye are obscurely banded, and there is a 
narrow but distinct transocular fascia of a dark color, which barely inter- 
rupts a broad and pure white superciliary-line passing from the bill to a 
short distance behind the eye. The forehead >and crown are much mixed 
with white. On the forehead the white forms a broad edging to the 
feathers and extending more narrowly around their tips confines the 
plumbeous ashy to triangular central patches ; but towards the crown it 
becomes restricted to the edges alone and when the occiput is reached, 
gives way entirely to the uniform plumbeous of that part. 
The peculiar color and marking of the wings, alike in both specimens, 
has already been so well treated by Dr. Coues that I will save repeating 
these details by referring the reader to his description, previously quoted in 
the present article. But in this connection it is necessary to call attention 
to two points which are not there noticed. The first is, that the seconda- 
ries , as well as the primaries, have the white areas on their inner webs. The 
second, that each successive primary, beginning with the first, is lighter 
and more plumbeous than the preceding one ; but with the first secondary , 
the color abruptly darkens again, becoming on the exposed portion nearly 
black, and continuing uniformly so to the tertials, which are of an equally 
dark cast. 
The bill is black; the tarsus, obscure flesh-color with a bluish tinge. 
The basal third of toes, with contained webs, pale yellowish ; the terminal 
portion, black. 
Dimensions . Bill (chord of culmen), 1.03 inches. Height at base, .46; 
width, .42. Tarsus, 1.37. Outer toe and claw, 1.65 ; middle, 1.70; inner, 
1.43. Wing, 9.88. Tail, 3.95; the graduation of the rectrices, .90. 
Young (£) No. 15,706, National Museum. Antartic Ocean, lat. 68° S., 
long. 95 0 W., March 21. (Peale’s type of Procellaria gularis'). Above 
cinereous-brown, inclining to black on the tips of the secondaries and 
tertials ; below, sooty-plumbeous ; throat and under tail-coverts white, 
transocular facise broad and dark. Otherwise generally similar to the 
adult (as represented by specimen No. 5224). 
Dimensions. Bill (chord of culmen), 1.05. Height at base, 50; width 
.45. Tarsus, 1.35. Outer toe and claw, 1.65; middle do., 1.65 ; inner do., 
1.36. Wing, 9.80. Tail, 3.90; graduation of the rectrices, .60. 
But before leaving the subject it becomes necessary to consider 
a Petrel which was unknown when Dr. Coues investigated the 
