REPORT OF NEW JERSEY STATE MUSEUM. 49 
FAMILY URTNATOR1ILE.—THE LOONS. 
Only two species occur in New Jersey. 
LoOn; Great Northern Diver —( Gavia imber). 
Adult, in summer, a very large, greenish-blaek-headed, black-throated loon, 
with the breast and belly white. The back and wings are greenish-black, with 
many, nearly square, white spots. There are spaces on the sides of the neck 
and breast, streaked with white, and on the sides of the body and under the 
tail spotted with white. This is the only species of loon breeding in New Jersey 
and thus the only one to be found at all seasons. 
Breeds in northern United States and winters south. Common transient on 
coast. Some winter in New Jersey. 
Red-tjikoated Loon—( Gavia lumme ). 
This is the smallest of our loons. It is found in the northern States from 
October to May, and irregularly south, in winter, to South Carolina. In winter 
this bird in all stages has the square white spots on the back. This separates 
it from the last species. All our loons are wild, wary birds. / 
Breeds in arctic regions and winters south. Rare, but frequents New Jersey 
coast in winter. 
FAMILY ALOIDaE—THE AUKS AND GUILLEMOTS. 
Five species of this family are found in New Jersey: The 
Little Auk; Razor-hilled Auk; Brunnich’s Murre; Black Guille¬ 
mot and Pnffin. 
Pueein —(Fratercula arctica). 
A very stout-billed diver, with the upper parts, including a band around the 
neck, brownish-black, breast and belly white, and the sides of the head grayish- 
white. 
Breeds in extreme north, sometimes coming as far south as New Jersey. 
Black Guillemot —(Cepphus grylle). 
In winter, a mottled, grayish-black-backed, white-bellied “sea pigeon, ’ with 
sooty-black wings marked with a white blotch, formed by the terminal half of 
the greater wing coverts. The back has the feathers more or less tipped with 
white. 
Breeds from Maine north to Newfoundland. Winters south. 
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