519 
1921 .] Bird-Migration by the Marking Method. 
5 August of the same year. One (Case 921) marked as a 
chick in Northumberland on 18 June, 1912, was found dead 
in the same district on 6 May, 1920. 
OYSTEECATCHEB (Hxmatopus ostralegus Linn.). 
One (Case 856) marked as a chick in Aberdeenshire on 
11 June, 1910, was recovered in Cheshire on 3 December, 
1915. Two (Cases 413 and 414) marked as chicks 
in Aberdeenshire in June 1912, were shot in Ireland in 
the same autumn, one at Broadhaven Lighthouse, County 
Mayo, on 22 August, and the other at Blackrcck, County 
Cork, in October. A fourth (Case 904) was marked as 
a chick in Sutherland on 29 May, 1913, and recovered 
in the neighbouring county of Boss about 13 August of 
the same year. 
An autumn migration of Oystercatchers from Scotland 
to Ireland was already known to occur, but whether partly 
of native birds or wholly of winter visitors was not 
established. The early dates in two cases are of interest. 
SNIPE (Gallinago gallinago Linn.). 
One (Case 415) marked as a chick in County Fermanagh, 
Ireland, on 12 June, 1913, was shot in County Longford 
on 6 October of the same year. 
COMMON TEEN (Sterna hirundo Linn.). 
One (Case 392) marked as a chick on the Aberdeenshire 
coast on 31 July, 1912, was picked up in the Firth of Forth 
about 7 September of the same year. Five others marked 
as chicks in various parts of Scotland were recovered near 
places where they were marked after intervals of less than 
two months (two on 21 August, and the others even earlier). 
LITTLE TEEN (Sterna minuta Linn.). 
One (Case 678) marked as a chick on the Yorkshire coast 
on 10 July, 1914, was recovered in Portugal in September 
of the same year. 
SEE. XI.—VOL. Ill, 2 M 
