1S92.] LooMis on Binh of Chester Comity, South Carolina. XX 



second week of April, others, as the Ilerniit Thrush, after the 

 middle of the month. A few linger well on into May, as the 

 Savanna and White-throated Sparrows and the American Pipit. 

 During April the Myrtle Warbler (an abundant winter resident) 

 attains its greatest abundance, illustrating the increase, from the 

 bulk below, of a species wintering here in numbers. The Amer- 

 ican Crow, a 'permanent resident,' does not altogether complete 

 its migration until the early part of April, though its breeding 

 season is well underway. The Robin migration closes about the 

 mitldle of the month, strangling parties bringing up the rear. 

 Summer birds continue to arrive, the majority of individuals in 

 some species passing further north. Transients vanish and others 

 take their places. In all waves are typically exemplified. From 

 the foregoing it will be seen that 'winter residents,' migrants, and 

 breeders overlap. The general dispersion of early breeding 

 birds, and later ones as well, which occurs after the young are 

 hatched, contemporaneously with the northward movement, is 

 not to be ascribed, of course, to reenforcement through migra- 

 tion, either northward or southward, nor is their coinparative 

 scarcity during the interval of confinement to the vicinity of the 

 nest to be attributed to the opposite cause, withdrawal from the 

 locality. 



After the first week of May the decline in the migrations be- 

 comes very evident. New arrivals ('firsts') cease to appear. The 

 scale of abundance among most transitory visitants rapidly de- 

 scends ; in a few, however, as the Bobolink, the failing point is 

 often not reached until about the 15th. With the progress of the 

 month, wider and wider gaps occur between the waves, and by 

 the first of June the rear gvi.ird consists only of stragglers. The 

 young in most species are now hatched and many are abroad. 

 By the middle of June the period of song in some birds begins to 

 wane, and generative organs to deteriorate, and incipient bird 

 gatherings to form, — all portending southward movement. 



Middle of June to November. — The departure of adult birds 

 of certain species, as the Black-and-white Warbler, at the close 

 of their season of reproduction inaugurates the southward migra- 

 tion in this region.* The precise time when old birds leave 



*It is not intended to impart the idea that the young, in varying numbers, do not, in 

 some instances, accompany the adults. 



