194 



This has been called dung-bird, from its watching the 

 smaller species of gull, and su soon as they have taken any 

 food, they pursue and attack them with the fury of a bird 

 of prey, and compel them to disgorge it, when this pur- 

 suer catches it commonly before it reaches the water. 



8. ARGENTATUS. ) 



/ A T? /"> I\^ A V TT -.T -"r f* A VW^-W / 



SILVERY, OR LESS 



VAR./3. MARINUS. LATH, t BLACK-BACKED 



) GULL. 



L. albus, dorso alisque canis, remigibus primoribus 

 versus apicem nigris. 



The bill is yellow, with an orange spot on the 

 lower mandible ; the irides are pale yellow ; the orbits 

 red orange; the head, neck, tail, and whole under 

 parts are pure white ; the back, scapulars and wings 

 are dusky black ; the prime quills are dusky, towards 

 their ends black ; the point of the first is white, with a 

 black tip; the second the same, with only a white 

 spot in the black ; the others are slightly tipped 

 with white ; two or three of the scapulars are also 

 tipped with white ; the legs are yellow. (Montagu.) 



9. ATRICILLA. LAUGHING GULL. 



L. albus, capite nigricante, rostro rubro, pedibus 

 nigris. Lath. 



The length is about 1 8 inches : it is larger than 

 the black-headed gull, and differs only from that 



