184 BIKD UALLEEY. 



three in numberj are laid on the groun!i and are a,lmost indistinguishable 

 from those of the jabove-mentioned allied spe6ies. 



Scotland, 11th June. 

 Presented ly Crrptain S. G. Reid ^- W: K. Ogilvie- Grant, Esq. 



No. 128. BLACK-HEADED or LAUGHING GULL. 



(Larus ridibundus.) 



The dark brown hood, from which this species derives its somewhat 

 inappropriate namcj is assumed in spring, but disappears after the 

 autumn moult. It is a common resident on the coasts of the British 

 Islands during, the colder . months of the year, but in spring resorts to 

 its breeding-places, where it congregates in large numbers. These "gul- 

 leries/' as tbey are called, are formed in marshy localities, or on inland 

 lakes, and some, like that on Scoulton Mere in Norfolk, have been used for 

 centuries. The nest is made of sedge, flags, etc., and placed on clumps 

 of rushes or on the ground. Three, or occasionally four, eggs, varying 

 greatly in colour and markings, are laid towards the end of April, and 

 in many places are regularly collected for the market. This Gull is a 

 useful friend to the farmer, feeding fer the greater part of the year on 

 grubs and other noxious insects. 



Inverness-shire, May. 

 Presented by Lord Lovat. 



No. 129. IVORY GULL. (Pagophila ebuvnea.) 



This Arctic species is an occasional wanderer to the coasts of the 

 British Islands. About thirty- five examples have been recorded and of 

 these rather more than half appear to have been adults. Two is the 

 full number of eggs laid. 



Cape Mary Harmsworth, Franz-Josef Land, 7th August. 

 Presented by F. G. Jackson, Esq. 



No. 130. COMMON TERN. (Sterna fluviatilis.) 



This well-known "Sea-Swallow" reaches our coasts towards the end 

 of April atid returns to the south between August and October. Its 

 numel-ous breeding-stations are scattered along the coasts of the British 

 Islands, as well as on inland freshwater lochs, The" food consists 



