128 Jones, Bird Miscration in Totva. T \ "hi 



6th and yth were warm, and the 21st to the end of the month, 

 the remaining time being cold. In 1889 the first half of May 

 was warm, with the 15th, 20th and 29th cold. In 1890 only 

 one cold period occurred, — about the 8th. Thus, in 1886, 1889 

 and 1890, when either the latter part of April was cold, or else 

 there were no marked changes of temperature during late April 

 and early May, the May movement occurred during the second 

 week. While in 1887 and 1888 the very decided warm wave 

 of late April caused a much earlier movement. 



May has another movement which occurs during the second 

 or third week. By that time the weather has become sufficiently 

 settled so that bird movements are hardly affected by the 

 changes which occur. 



June is the month of final reckoning. No species arrive, but 

 tardy ones leave for more northern nesting grounds. The weather 

 is always warm and balmy. 



This hasty survey of the weather with the migration movements, 

 shows us that the more decided changes of temperature greatly 

 influence bird movements ; but the less decided changes do not 

 greatly influence some species. This leads us to the consideration 

 of such species as are not dependent upon the weather to any 

 considerable extent. These arrive upon nearly the same date 

 year after year. They are as follows : — 



March 19 (two days). Towhee, Cooper's Hawk, Cowbird, White-rumped 

 Shrike. 



March 28 (two days). Field Sparrow, Purple Finch. 



April 5 (two days). Purple Martin, Ruby-crowned Kinglet, Chipping 

 Sparrow, Belted Kingfisher. 



April 28 (two days). Oven-bird, Dickcissel, Kingbird, Palm Warbler, 

 Wood Thrush. 



May 3 (two days). Chestnut-sided Warbler, Yellow Warbler, Rose- 

 breasted Grosbeak, Red-eyed Vireo, Catbird, 

 Orchard Oriole, Baltimore Oriole. 



May 19 (two days . Traill's Flycatcher, Black Tern. 



In addition to these groups, which migrate at certain fixed 

 times, and of course in company in a certain sense, there are 

 similar groups which are more irregular with regard to fixed 

 dates, but which move in company no less regularly. To these 



