22 



further illustrate several important points. As regards the number 

 and time of occurrence of bird-waves during several years, the data 

 collected by the Club show a remarkable correspondence, as also a 

 similarity in the species of birds which composed the several waves. 

 This can readily be seen from the following comparison of the waves 

 of 1890 and 1891, the date of each wave being given, followed by the 

 most characteristic species. 



1890. 

 Feb. 12-14. 



Purple Grackle. 



Robin. 



Bluebird. 



Red-winged Blackbird. 



Flicker. 



Feb. 26-27. 

 Same. 



April 3-4. 



Flicker. 



Chipping Sparrow. 



April 12-14. 



Chipping Sparrow. 

 Hermit Thrush. 

 Myrtle Warbler. 

 (Thrasher.) 

 (Barn Swallow.) 

 (House Wren.) 



April 22-23. 



Chimney Swift. 

 Hermit Thrush. 

 (Black and White Warbler.) 



1891. 

 Feb. 18-19. 



Purple Grackle. 



Robin. 



Bluebird. 



Red-winged Blackbird. 



Flicker. 

 Feb. 23-25. 



Same. 

 April 5. 



Flicker. 



(Chipping Sparrow.) * 



Myrtle Warbler. 



Pewee. 

 April 12-14. 



Pewee. 



Chipping Sparrow. 



Hermit Thrush. 



Barn Swallow. 



(Thrasher.) 



April 18-19. 



Chimney Swift. 



Barn Swallow. 



Hermit Thrush. 



(House Wren ) 



(Maryland Yellow throat.) 

 April 23. 



Thrasher. 



Myrtle Warbler. 



House Wren. 



Black and White Warbler. 



Maryland Yellow-throat. 



(Wood Robin.) 



(Black-throated Blue W.) 



♦Species in parentheses were migrating during the wave, but only in smail numbers. 



