1908.] NATURAL SCIENCES OF PHILADELPHIA. 151 



Wave VIII. 



1904. 1905. 1906. 1907. 



April 23-26. April 22-25. April 21-25. April 26-28. 



First Arrivals — Nine species have arrived on this wave in at least 

 three of the four years, i.e., Scarlet Tanager, Yellow Warbler, 

 Black-throated Green Warbler, Ovenbird, Water Thrush, House 

 Wren, Catbird, Wilson's Thrush and Wood Thrush. Five othei-s 

 arrived in two out of the four seasons, i.e., Rose-breasted Giosbeak, 

 White-eyed Vireo, Redstart, Maryland Yellow-throat and Yellow- 

 breasted Chat. 



Bulk Movement — The bulk of this wave comprised the same seven 

 species in each of the four years, i.e., Chimney Swift, Barn Swallow, 

 Black-and-Wliite Warbler, Myrtle W^arbler, Maryland Yellow- 

 throat, Brown Thrasher and House Wren. To these are to be added 

 the Yellow Warbler in 1904 and the Ovenbird in 1907. 



Wave IX. 



1904. 1905. 1906. 1907. 



April 29-Mayl April 29-30. April 29-May 1. May 1-3. 



+ May3. 



First Arrivals — Six species arrived on this wave each year, i.e., Balti- 

 more Oriole, Kingbird, Red-eyed Vireo, Blue- winged Warbler, 

 Magnolia Warbler, Parula Warbler, and in three of the four years 

 Great Crested Flycatcher, Indigo-bird, Yellow-throated Vireo, Black- 

 throated Blue Warbler. 



Bulk Movement — Seven species were abundant during this wave in 

 each of the four years, i.e.. Black-throated Green Warbler, Redstart, 

 Water Thrush, Ovenbird, Catbird, Wilson's Thrush and Wood 

 Thrush, and in three of the four the Yellow Warbler and Scarlet 

 Tanager. 



Wave X. 



1904. 1905. 1906. 1907. 



May 5-8. May 3 + 7. May 5-6. May 8 + 10-12. 



First Arrivals — Species usually arriving on this wave Chestnut-sided 

 Warbler, Blackburni an Warbler, Canada Warbler, Black-poll Warbler, 

 Wood Pewee, Hummingbird, Yellow-billed Cuckoo. 



Bulk Movement — In all four years Baltimore Oriole, Wood Pewee, 

 Great Crested Flycatcher, Indigo-bird, Rose-breasted Grosbeak, 

 Scarlet Tanager, Red-eyed Vireo, White-eyed Vireo, Yellow-breasted 



