Mr. JeEnyns on the Ornithology of Cambridgeshire. 321 
Sp. 134. L. ridibundus, Temm. Man. d' Ornith. p.780. 
BLACK-HEADED GuLL.—In some seasons these birds frequent 
our fens in great plenty. Specimens shot near Bottisham in the 
beginning of October. wanted the black head; from whence it 
appears that the periodical change which takes place in the colour 
of that part, is completed before that time. 
Genus LII. LESTRIS, Illig. 
Sp. 135. L. pomarmus, Temm. Man. d’Ornith. p.793. 
A specimen of this rare bird (which has been only very lately 
discovered in this country) is in the collection of Dr. Thackeray, 
and was shot near Cambridge. 
Genus LIII. ANAS, Linn. 
Sp. 136. A. Anser ferus, Temm. Man. d’Ornith. p. 818. 
Common W1Lp Goosr.—Bewick observes that many of these 
birds are known to remain in the fens of Cambridgeshire and to 
breed there. This may have been the case formerly, but I never 
heard of an instance myself. 5 
Sp. 137. A. Segetum, Temm. Man. d’Ornith. p. 820. 
BEAN GOOsE. 
Spr. 138. A. albifrons, Temm. Man. d’Ornith:. p. 821. 
Spe. 139. 
WHITE-FRONTED GOOSE. 
A. Bernicla, Temm. Man. d’Ornith. p. 824. 
Brenr Goose.—This and the three preceding species are indis- 
criminately called Wild Geese by the country people, and occa- 
sionally appear in the Cambridge market under that name, more 
particularly the A.Segetum.. They are all found in our fens during 
the winter months, in greater or less plenty according to the severity 
or the mildness of the season. The earliest flocks which I ever 
. noticed were seen on the twentieth of October; this, however, is 
not much before the usual time of their first arrival. 
