INTRODUCTION. 
cxxxv 
Genus Rhodostethia. 
Established for the beautiful Gull named after Captain James Ross, the celebrated navigator. 
381. Rhodostethia Rossii .......... Vol. V. PI. LXIII. 
Ross’s Gull. 
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 Chroicocephalus. 
The members of this section of tbe 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 changes in the colouring of their plumage. 
382. Chroicocephalus ridibundus ......... Vol. V. PI. LXIV. 
Black-headed Gull. 
A common and resident species. 
383. Chroicocephalus Philadelphia ......... Vol. V. PI. LXV. 
Bonaparte’s Gull. 
An occasional visitant from its native country. North America. 
Genus Hydrocolceus. 
Instituted for our well-known Little Gull. 
384. Hydrocolceus minutus Vol. V. PI. LXVI. 
Little Gull. 
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. 
