135 

 Gen. LXVI. LARUS. Lh 



259 sp. Larus ridibundus. Leisl. The black-headed Gull. 

 Xema atriciUa. Bonap. 



Xest April — May, on the margin of ponds and inland lakes. 



Eggs. 3, olive green, brown, or bluish green or yellow, spotted and blotched with purple- 

 grey and dark olive-brown. 



259 « 



259 <^ 



259 c 



260 sp. * Larus capistratus. Tem. The masked Gull. 

 Xema capistratwn. Boie. 



Nest, in Arctic regions, and in the Orkneys ; rare on the English coast. 

 Eggs. 3, ? " smaller than those of the L. ridibundus, greenish grey, with spots of 

 darker shade." ? Tem. 



260 « 



160 5 



260 c 



