THE BIRDS OF THE LEA VALLEY RESERVOIRS. 201
The Red-necked Grebe, Podiceps griseigena griseigena (Bodd.).
A rare visitor which has been recorded on four occasions:
two, during February, 1924; two, January 16th, 1926; two,
November 27th, 1927; and two, February 12th, 1928.
The-Black-necked Grebe, Podiceps nigricollis nigricollis Brehm.
A rare visitor, which has been reliably recorded once only.
One was seen on the King George Reservoir on September 16th,
1933, by Mr. K. R. Ashby.
The Little Grebe, Podiceps ruficollis ruficollis (Pall.).
A resident in small numbers, one or two pairs nest annually.
It becomes commoner after the breeding season, but the Reservoirs
cannot be described as a favoured haunt. Fourteen were seen
on September 25th, 1926, this being the largest number
recorded.
The Great Northern Diver. Colymbus immer Brunn.
It has been recorded reliably once only. One was identified
by several observers on February 16th, 20th and 28th, 1932.
The Black-throated Diver, Colymbus arcticus arcticus L.
It has been recorded once only. One was seen by Mr. F. R.
Finch on the Racecourse Reservoir on December 29th, 1930,
and by the present writer on January 1st, 1931.
The Red-throated Diver, Colymbus stellatus Pontopp.
A rare winter visitor. One, which was shot in November,
1911, is now in the Essex Museum at Stratford. In 1924 the
present writer identified one on February 16th, two on March 1st,
and one on November 15th.
The Oyster-Catcher, Haematopus ostralegus ostralegus L.
Mr. J. S. Jeffree has one in his collection, which he obtained
at the Reservoirs, and he has seen this species on other occasions.
Mr. K. R. Ashby saw one at the King George Reservoir on
December 24th, 1933.
The Ringed Plover, Charadrius hiaticula hiaticula L.
An irregular passage-migrant, almost entirely on the autumn
movement. One seen on March 8th, 1924, is the only spring
record. On the autumn migration it has been recorded in the
years 1922, 1924, 1926, 1928, 1929, 1931 and 1933, and in the
months of August and September, but more often in the latter
month, and once in October. In most cases single birds were.