The Brantian Estate area was mostly in secondary forest and was situated on the Brantian River. There were some fairly large areas of grass with water buffalo wallows in them. These grassy areas were favorite haunts of the Painted Quail, _Coturnix chinensis_. TENOM.--The first locality that we investigated was 5.5 miles southwest of Tenom, approximately 4,000 feet elevation, in moss forest. A few days were spent collecting in the area of Tenom itself. _Moss forest._--The lower altitudinal limit of the moss forest was about 3,600 feet. The trees on top of the mountain were mostly oaks (_Quercus_) and were festooned with ferns, orchids, and other epiphytes. The area had been used as a triangulation station by a survey team and a small area on top of the mountain had been cleared earlier. At the time of our visit this small area had grown to secondary vegetation, mostly _Pandanus_. The oaks in the primary forest surrounding this disturbed area were generally about 30 to 50 feet high and there was little undergrowth in virgin stands. This area was usually swathed in fog from three o'clock in the afternoon until eleven o'clock the next morning. One morning of our fourteen there was clear. _Paddy._--The area visited at Tenom itself consisted mostly of old paddy grown to grass and scrub. Forest did occur but was of secondary nature in the immediate vicinity of Tenom. SIAMIL ISLAND.--This island is about one mile in circumference and the highest point is about 300 feet above sea level. The island has high bluffs on three sides but slopes gently to the sea on the other. There were patches of forest left on the island, one on the north side and one on the south. The sheer bluffs on the east side of the island were covered with _Pandanus_ sp. The undergrowth of the north forest had been cut, leaving extensive bare areas. The principal undergrowth was rattan. The natives are clearing and planting more of the island to coconuts and hope eventually to clear it completely. KARINDINGEN ISLAND.--This island, about half a mile in circumference and between 10 and 20 feet above sea level at its highest point, was surrounded by extensive coral reefs and sand; the principal vegetation was mangroves. ECOLOGICAL AFFINITIES OF THE AVIFAUNA AT QUOIN HILL