188 
TARROCK GULL. Cass Il. 
the color of that, the throat, neck, and whole 
under side, are white; near each ear, and un- 
der the throat, is a black spot; on the hind part 
of the neck is a black crescent, the horns point- 
ing to the throat. The back and scapulars are of 
a bluish grey; the lesser coverts of the wings 
dusky, edged with grey ; the larger next to them 
of the same color; the rest grey; the exterior 
sides, and ends of the four first quil feathers are 
black; the tips of the two next black; all the 
rest wholly white; the ten middle feathers of 
the tail white, tipt with black; the two outmost 
quite white; the legs are of a dusky ash color. 
In lieu of the back toe, it has only a small pro- 
tuberance. 
