384 MICHIGAN SURVEY, 1&08. 



Stations : Rock Harbor, Spruce and Balsam Forest, I, 2-3 ; Spliag- 

 nnm and Spruce Bog, st. I, 6; Along Benson Brook, II, 

 1. II, 4. Ill, 3. IV, 7. 

 Siskowit Bay, A , 4; Partial Clearing, II, 1. 

 Washington Harbor, Clearings, I, '04; Forest, II, '04. 

 Migration : August 24 ; September 14. 



The Wilson's Thrush was very common on nearly all parts of the 

 island, living in the balsam forests. This bird was first seen July 6 

 and was common throiighout July and August. At Rock Harbor it was 

 observed in all the balsam-spruce forests and was often seen along 

 Benson Brook (II, 1) at McCargoe Cove (II, 4) and on the rock ridges 

 near Sargent Lake (II, 3). They were also found among the birches and 

 balsams at the west end of Rock Harbor (III, 3). It was occasionally 

 seen in the birch forest near the bead of Tobin Harbor (IV, 7) and at 

 Siskowit Bay, V, 4. 



109. Hylocichla aliciae (757). Gray-cheeked Thrush. 



Range : Eastern North America, west to the Plains, Alaska, and east- 

 ern Siberia, north to the Arctic coast, south, in winter, to Costa Rica. 

 Breeds chiefly north of the United States. 



Stations: Washington Harbor. Clearings, I, '04. X, '04. 



Migration: September 5, 12 to 21 when observations closed. 



The first record was a specimen found dead at Washington Harbor on 

 September 5. (X, '04). This was at the close of a heavy gale lasting 

 since the fli'st, and the bird had flown against a lighted window during 

 the night previous. Many other species were killed at this same place dur- 

 ing this storm, the lighted windows proving a much more fatal place 

 during storms and on cloudy nights than during clear weather, probably 

 because the birds fly lower on such nights. This specimen was killed on 

 the north side of a pavilion. Xo others were seen until September 12, 

 when in company with thousands of other migi'ants, it was very abun- 

 dant in the clearings. 



Large flocks were seen every day throughout the remainder of my stay, 

 the border of clearings and the roadways being the places where they 

 were the most abundant. 



110. Hylocichla ushilatn sKahisoni (738a). Olive-backed Thrush. 

 Range : Eastern North America and westward to the Upper Columbia 



River and East Humbolt Mountains, straggling to the Pacific coast. 

 Southward in winter to Cuba, Guatemala, Xicaragua, Columbia, Ecua- 

 dor, and Peru. Casual in Bermuda. Breeds in the northern Alleghanies, 

 the Catskills, the mountainous parts of southern Xew England, southern 

 Sierra Nevada, and northward. 



Stations : Rock Harbor, Beach at Rock Harbor, I, 1 ; Spruce and 

 Balsam Forest, I, 2-3. 

 Partial clearing, I, 1, II, 1; Partial clearing along Ben- 

 son Brook, II, 1; Rock Ridge clearings, II, 3. 

 Siskowit Bay, Forest, V, 4. 



Washington Harbor, Clearings, I, '04; Forest, II, '04. 

 Breeding: July 8 nest with 3 young. August 3, two young just able 

 to fly. ' " 



Migration : Prom about the middle of August to September 17. 

 The Olive-backed Thrush was a common breeder throughout the island 



