BLACK- THROATED DIVER. 
193 
Out of Europe, Temminck’s collections from Japan 
contain identical specimens ; and in various parts of 
North America it is not unfrequent, reaching as far 
south as Texas and the Columbia river, and towards 
the north having been seen by the arctic voyagers 
on Hudson’s Bay and the coasts of Melville Penin- 
sula. 
In this beautifully marked species, which we con- 
sider typical, the head and neck are of a deep rich 
grey, similar in texture to tho plumage of the Guil- 
lemots, and on the cheeks shading into the rich dull 
black which prevails on the chin ; this is separated 
from the gular patch by' a gorget of feathers striated 
black and white, surrounding the patch, running 
down upon the sides of the breast, and nearly meet- 
ing on the back of the neck ; the striated appear- 
ance is produced by the feathers being black, with a 
streak of white on each margin ; the gular patch is 
deep black, having a rich gloss of purple, conspi- 
cuously seen when viewed across; it ends in a 
peaked form upon the centre of the breast ; the 
under parts pure white, sides of the tail greenish 
black, axillary feathers white ; the upper plumage 
is deep glossy black with green reflections ; on the 
upper part of the back or mantle there are two 
lengthened patches of square white spots, separated 
from the scapular patch ; the latter runs the whole 
length of the feathers, and has the markings of a 
large size, running in fourteen or fifteen bars ; the 
wing-covers are marked with an oval spot on each 
web ; quills and tail black ; feet and legs black, the 
