278 Bbtbr, Ai.i.isox, Koi'mw, Hi rils of Louisiana. [.July 



Orleans by March 15 or from one to three days later. Sometimes 



it delayed second warm period takes its place; SO thai from March 



12 or K> to March is there is almost invariably a period of con- 

 siderable migration. The regular arrivals are the Prothonotary 

 Warbler, t In* Blue-gray Gnatcatcher, the Chimney Swift, and the 

 Red-eyed Vireo, though the hist is frequently not seen until the next 

 'wave.' Herons and the Limicolee increase. White-eyed Vireos 



become decidedly common, the lirst individuals thai winter e\t ra- 



limitally arriving early in March. Hooded Warblers become rather 

 common, and Parulas increase very decidedly. The bulk of the 



Robins have left by the beginning of this period, and Golden- 



crowned Kinglets are not much observed thereafter. Yellow-bellied 

 Woodpeckers grow scarce, and the last Orange-crowned Warbler 



is seen. 



Periods of migration follow each other in rather rapid succession 



from this time on. There are often three separate ' waves' between 



March 20 and April 1 at the latitude of New < )rle;ins. Character- 

 istic of the lirst 'wave', occurring abont March 22, IS the Orchard 

 Oriole, though the number of individuals is always small so early. 



The Red-eyed Vireo is a certain arrival at this time, and the King- 

 bird may be expected. The advance of Tree Swallows becomes 

 general. Prothonotary Warblers are apt to be fairly common for the 

 first time. Hooded Warblers become exceedingly plentiful. The 



appearance of the lirst Ruby-throated Hummingbirds ceases to be 



casual. Gnatcatchers become common. Herons and various spe- 

 cies of Limicolee, especially Totanus solitarius, arrive in large num- 

 bers. If a second wave follows this in a few days, it is not generally 



notable excepl for an increase of most of the kinds, lately arrived. 

 The last 'wave' in March, commonly occurring from March 29 to 

 March 31, is a very important one. Regular arrivals at this time 

 are the Crested Flycatcher, the [ndigo Bunting, tin 1 Barn Swallow, 

 the fellow-throated Vireo, the Kentucky Warbler, and the Wood 



Thrush. Occasionally sonic of these arrive with the preceding 



wave. Hummingbirds now become common. Of more uncer- 

 tain occurrence are the Wood Pewee, the Green-crested Flycatcher, 

 the Summer Tanager, the Warbling Vireo, Swainson's Warbler, and 

 the Yellow Warbler. The last Robins are seen ordinarily at this 



time; Rubv-crowncd Kinglets are common for the last lime, and 



