14 ALAUDID#—CYPSELID4 
113. Corvus coroneg, Linn. Carrion-Crow. 
+) 
Resident and common everywhere. A considerable immigration in 
the autumn, in October, when the grey crows come. Nests on the cliffs 
at Flamborough. The winter visitors leave the district in March and 
April. 
114. Corvus cornix, Linn. Hooded Crow. 
Oceasionally remaining to nest, particularly in the neighbourhood 
of Flamborough. Immense immigration in the autumn in October and 
November. Depart from the middle of March and throughout April, 
some few lingering to the second and third weeks in May. In 1891 a 
flock of sixteen remained all summer at Flamborough. 
115. Corvus FruGILEGUS, Linn. Rook. 
Resident and very numerous. Immense numbers arrive from the 
east in October and November, the movement being continued for weeks 
together. A return migration to the continent in March and April. 
Family ALAUDID A. 
116. ALAUDA ARVENSIS, Linn. Sky-Lark. 
Common and resident. Enormous immigration in the autumn from 
the first week in August up to the end of the year, the main body in 
October. The movement is continuous night and day. Larks are not 
observed to congregate for the return migration in the spring. On the 
approach of severe weather in the winter they assemble in great flocks 
and move south in continuous flights. 
117. ALAUDA ARBOREA, Linn. Wood-Lark. 
Resident throughout the year and nesting, but very locally. Occasion- 
ally on migration in the autumn in small numbers near the coast or in 
stubbles. Appears at its nesting quarters about the third week in 
April, and is very partial to the vicinity of coniferous trees, although 
usually singing from some lower elevation. 
118. Orocorys ALprestRIS, Linn. Shore-Lark. 
Since 1880 a very regular immigrant in the Spurn district, but 
irregular in number; was more abundant in 1888, 1889, 1890, 1891, 
1894-’95 and 1898-’99. It is not so common on the Lincolnshire coast ; 
the latest occurrences in the spring are March 18th, 20th, and 22nd in 
different years. 
Order PICARIE. Family CYPSELIDA. 
119. CypseLus apus (Linn). Swift. 
Summer visitor, arriving in May. On April 5th, in 1887, several at 
the Spurn, which remained all night in the recesses of the windows of 
the lighthouse. Numbers of swifts commence flying south along the 
coast as early as the last week in June. The latest occurrences are 
October 18th in 1891, and at Great Cotes on December Ist, 1888. 
