62 PROCEEDINGS OP THE 



From similar comparisons of fortj' species of April and May 

 migrants, we find that tlie dates liy which they had been recorded 

 at half of our stations, averaged four days later in 1907 than in 

 1906, and three days later in 1907 than in 1905. The actual 

 difference in the various species varying from one to seven 

 daj's. In only four instances was the 1907 date earlier or 

 equal as compared with 1906, and in only six as compared with 

 1905. 



It is noticeable that the late May migrants are later both in 

 first appearance and in bulk arrival than those of April .and 

 early May. 



In summing up the spring migration of 1907 then, we find 

 that there was no trace of the usual February migration, the 

 March flight was about normal, with some exceptionally early 

 stragglers. April was characterized by a straggling migration 

 without any concentrated movement until the last week when 

 birds arrived with a rush. The same straggling migration char- 

 acterized the early part of May with another phenomenal rush 

 on the 11th and 12th, and a final movement on the 19th. fol- 

 lowed by another delay, which kept migrants here until 

 June 15th. 



The first arrival of most species was nearly normal, but the 

 bulk movements were seriously delayed. 



