The Bonaparte Gull (Larus philadelphia) has been definitely recorded as nesting at Atlin Lake in extreme northwestern British Columbia (Brooks and Swarth, Pac. Coast Avifauna No. 17, 1925, p. 28). These authors refer also to reported nesting colonies at Fort St. James and at Moorehead Lake in the Cariboo region, the latter reference being based on evidence submitted by local residents and observations, by the senior author, of small flocks of adult Bonaparte Gulls flying directly toward this lake after fishing in lakes some twelve miles to the southwest. This was in July, 1901. Apparently these are the only references in literature to the species nesting in British Columbia. Consequently the discovery on June 24, 1935, of a small nesting colony at Bridge Lake in the Cariboo region is considered of sufficient interest to place on record. The location and topography of Bridge Lake is set forth in an article describing a Herring Gull colony at .that place. (See Munro, Condor, 37, 1935, pp. 214-215.) It was following a visit to this Herring Gull colony, and while returning to shore, that the presence of Bonaparte Gulls was detected through seeing a single individual of this species fly toward a small wooded island situated about half way between the gull rock and the mainland. While I was proceeding toward this island and was distant from it about 150 yards, two adult Bonaparte Gulls flew toward the boat, and after circling over, and swooping down several times, alighted on the water alongside. These were photographed at a distance of twelve feet. The two birds followed the boat with short flights, descending on the water between times, and became increasingly excited as the wooded shores were neared. The reason became apparent when two downy young were discovered swimming in and out among the flooded brush along the shore. These were captured without difficulty and proved to be approximately a week old, with sheathed primaries showing about threequarters of an inch beyond the down. Meanwhile the two adults, sometimes accompanied by a third, either circled overhead or stood on a dead branch of a birch tree which extended over the water