°j8 , I Jones, Bird Migration in lozva. I "^ I 



dering. The species which arrive during this time are among 

 the most common of the bird fauna, and are represented by large 

 numbers of individuals. 



It is interesting to note the average number of moving species 

 for each month during the five years. Of those which first 

 arrived there were four in February, seventeen in March, thirty 

 in April, forty-one in May, and none in June. Of those which 

 arrived the previous month and became common, or those which 

 decreased in numbers but did not finally depart until the following 

 month or later, there were none in February, five in March, five 

 in April, four in May, and none in June. Of those which 

 departed to more northern breeding grounds, there were none in 

 February, two in March, ten in April, eighteen in May, and two 

 in June. 



Adding these three sets together, the total number of moving 

 species by months is for February four, March twenty-four, April 

 forty-five. May sixty-three, June two. Of the whole average 

 movement there is for February 2.8 per cent, March 17.3 per 

 cent, April 33.4 per cent. May 45 per cent, June 1.5 per cent. 

 Deducting from April the late April arrivals of 1887 and 1888 

 which properly belong to May, and adding them to May, there is 

 left for April 27.6 percent, and for May 50.8 per cent. Half of 

 the whole spring movement occurs in May ! These percentages 

 are based only upon species. If individuals were taken into 

 account the percentage for May would be much higher. When 

 we remember that nearly all of the species which arrive in May 

 have come before the beginning of the third week, some con- 

 ception can be formed of the magnitude of the ' early May wave.' 



March, April, and May are the months of bird migration. 

 February cannot be wholly counted out, but June records might 

 almost be considered accidental. March species are larger, 

 stronger and hardier. April species transitional, and May species 

 smaller, weaker and more delicate, but more numerous. 



The irregularity in the arrival of individuals of the same 

 species is one of the first notable things about the migrations. 

 Males and females do not travel together. My notes upon the 

 movements of the sexes, and upon the arrivals of old and young 

 males are pretty full, covering fully five years. Notes on the 



