- 9 - Although chloris is not as numerous as Zosterops, it is by far the most frequently seen and most conspicuous bird (both by sight and sound) on these islands. The calls are very loud and strident. They are heard every early morning and every late evening, and at intervals throughout the day - often by solitary birds. On e wonders what stimulus causes these latter to call. Ordinary call is very loud and usually in triplets: "clip clip clip, clip clip clip," or it can be a steady series of "dip's". When the birds are more excited, they follow the clip series with a sort of "hee-haw" the first syllable is low, the 2nd much higher. Very loud and creaking. These are the notes given by three or more birds indulging in aerial manou-vres several hundred feet above the ground. "clip" note can be given in two's, or more often, merely in a long series with irregular intervals between notes. Hirundo rustica Saipan 7 Feb 45. Flock seen flying over Casuarina trees at S border L Susupe. About 15 in flock. I found that they were for-aging low over a pond out inthe open part of the swamp, so I hid in some caee there and shot one that was perched on a cane over the water. There were other swallows in this flock. Seen on one other occasion at the Lake. Tinian 4 Apr. One lone bird flew around a few times over L. Hagoi. 7 Apr: Saw one in the early morning when I was picking up rat traps near the piggery N. Camp Churo. It took abut 3 trips along a road that paralleled a line of acacia trees. Brown and White Swallow Saipan 7 Feb 45 Flock watched, and birds seen at fairly close range but not collected. Appeared to be all dark rich brown above and pure white below, with a slightly indented tail. Didn't look like Rough-winged Swallow, nor did it have the chest band of the Bank Swallow. Also seen at same place (sw edge L Susupe) 1 Feb 45. Acrocephalus luscinia Saipan 10 Dec 44 Not noted in L Susupe marshes. 31 January 45: Cane and marsh east Charan Kanoa. Several singing in afternoon, one called up by squeeking. Stayed in densest cane. In marshy area. Since then found to be common in the entire lowland around Lake Susupe, with special abund ance in the area of the civilian hospital, where there are many small trees planted. The birds here are tame, come right around the wards, and can be heard singing all day, and on moonlit nights. For the most part they require marshy habitat where there are a few larger trees, such as Casuarina sticking up above the cane. For-the Generally stay low in the cane, but ascend sometimes