INTRODUCTION.

CXXXV

Genus Ruoposreruta.

Established for the beautiful Gull named after Captain James Ross, the celebrated navigator.

381. Ruovosreruta Rossi : : : ‘ 2 : ; : Vol. V. Pl. LXUIL.
Ross's Guu.

Has been killed two or three times in Britain. The plate should be referred to to form a just idea of this

fairy Gull, whose natural home is within the arctic circle.

Genus CurorcocernaLus.

The members of this section of the Gulls have many pleasing traits in their character; thus they have the
habit of spending their summer in large communities, and of selecting as a site for their breeding-place the
inland waters of some marsh or swampy island in the interior of the country. Their interest is also much

added to by the circumstance of their being subject to seasonal clianges in the colouring of their plumage.

382. CHROICOCEPHALUS RIDIBUNDUS ; : : : : : : : : Vol. V. Pl. LXIV.
BLack-HEADED GULL.

A common and resident species.

Wolk, We JA ILA,

383. CHROICOCEPHALUS PHILADELPHIA
Bonaparte’s Guu.

An occasional visitant from its native country, North America.

Genus Hyprocoiaus.
Instituted for our well-known Little Gull.

384, HyprocoL@us miINnuTUS : : : , : : : Vol. V. Pl. LXVI.

Lirrie Guut.

A tolerably regular winter visitant, never breeding in Britain.

Genus XEMA.

The beautiful arctic Gull named after the late Mr. Sabine is the type of this genus.