300 BIRDS. 



immature male was seen, after which no more were seen until Aug- 

 ust 7, when a few were observed in company with a flock of migrating 

 bay-breasted warblers at the end of the Point. These had probably 

 crossed the bay during the night, as the spot had been most thorough- 

 ly worked the day before, and none of either species were seen. On 

 August 10, a male was seen in the jack pines on a sand dune north of 

 Rush Lake. It was not observed after August 14. 



103. Dendroica castanea. Bay-breasted warbler. — Michigan: 

 Common migrant especially in the fall; breeds in extreme north por- 

 tion '(Isle Royale, July 7, 1905). 



Common migrant on Sand Point. Not observed elsewhere in the 

 sand region except a single individual near Rush Lake, on August 

 10. The first bird was seen on August 6. After August 14, it was 

 seen in flocks, often in company with blackburnian warblers. On 

 August 25, we observed several flocks near camp on Sand Point, 

 feeding in the large oak trees but seldom in the pine or other trees. 

 They were common when w^e left camp on August 27. 



104. Dendroica blackbumiae. Blackburnian warbler. — Michigan: 

 Common migrant and summer resident, breeding north of latitude 

 43°, 



Common on Sand Point. A single bird observed at Rush Lake. 

 This species was a common breeder on the Point and was seen or 

 heard singing nearly every day. It frequented the tops of the tallest 

 jack pines, where it no doubt nested, but no nests were found al- 

 though many pairs were watched carefully. Our inability to locate 

 nests was due to the height of the trees and the multitude of mos- 

 quitoes that bred and lived near the haunts of this species, and made 

 it almost impossible to continue long observations. On July 24, a 

 brood of nearly fledged young was found and watched while the 

 parents fed them. When we left the Point, on August 27, the species 

 was abundant. 



105. Dendroica virens. Black-throated green warbler. — Michi- 

 gan: Abundant migrant and common summer resident, breeding 

 north of latitude 43°. 



A rather rare breeder but common migrant in the sand region. 

 This species was found in the jack pines on the dunes southwest of 

 Caseville, on July 7. No nests w^ere found, as this locality was not 

 worked in detail, but the birds were singing, and, on July 24, a 

 juvenile bird was taken there as it was being fed by the female. 

 This bird was very young and the nest must have been close by. 

 Other young birds were seen on the Point at the same time. About 

 August 1 it became very common in flocks, no doubt from across the 

 bay, as it was found breeding in Iosco County in June, 1907, by Miss 



