112 Tue WiLson BuLteTrin—NOo. 7o. 
tember 28 and 29, a great increase in numbers was noted, but 
most of these passed on during the night of October 2, and the 
last were seen on October T. 
159: (1582) Hylocichla ustulata — sivainsoni, OLIVE-BACKED 
THRUSH.—On the night of. September 4, there occurred a large 
migration of thrushes, mostly of this species. The night was 
warm, and at midnight a storm came up from the northeast. 
Thousands of birds came to the light, and great numbers were 
seen to be of this species. ‘The darkness and the rain confused 
them, and many came close enough to the light to make identifi- 
cation certain. Some struck the glass and were killed, while oth- 
ers fiuttered around and against it, calling loudly all the while. 
All the thrushes that were killed belonged to this species. By 
September 10, it was scarce and remained so until September 28. 
when it again became common. The last were seen on October 7. 
160. (759d) Hylocichla guttata  pallasi. TerRMir THRUSH.— 
This species was first seen on September 15, and it was only occa- 
sionally observed after that until September 29, when hundreds 
came to the island, with the olive-backed and _ gray-cheeked 
thrushes. These nearly all left the island on the nignt of October 
5, and none were seen after October 7. 
161. (761) Planesticus migratorius migratorius.  Rosin.—A few 
robins were found on the island when we arrived, and both old and 
young birds were noted. The keepers said that a few were seen 
about the pond during the summer. Only a few were seen until 
August 381, when some migrants arrived. The birds were often 
seen on the mud flats at the edge of the pond, and they also fed 
on the bearberries at the edge of the woods near by. On October 
1, they became common and continued so as long as we remained 
on the island. 
162. (766) Sialia sialis sialis. BLUEBIRD—No  bluebirds were 
seen by the writer, but Captain McDonald said that the species is 
very common during migration in the spring and fall. According 
to him, it comes in flocks in the latter part of October and early 
November. 
