Jones — Migration at Oberlin, O. 



201 



The average variation between first arrivals (earliest and 

 latest) for all of the species here listed is 21 days. The av- 

 erage variation of first arrivals of the water birds is 33 days, 

 and of the land birds 20 days. The variation in the land 

 birds which remain to breed is 20 days, of the transient spe- 

 cies is 19 days. The land bird with the least variation is the 

 Black-throated Green Warbler with 8 days, and the greatest 

 variation is the Pipit, with a variation of GG days. It is like- 

 ly that the regular route of migration of the Pipit does not 

 cross this region, since only occasional scattered flocks are 

 found. The March 15, 1901, record is my own. There were 

 two birds, one of which was secured for positive identification. 



Number 



Records 



Crow 19 



Robin 19 



Killdeer 19 



Bluebird 19 



Canada Goose 14 



Meadowlarli 18 



Bronzed Grackle 19 



Song Sparrow 19 



Northern Flieljer 17 



Red-winged Blaclibird. . . 19 



Blaclj Ducli 11 



Baldpate 9 



Redhead 8 



Mourning Dove 14 



Migrant Shrike 19 



Canvas-back 7 



Cowbird 19 



Rusty Blackbird 19 



Towhee 19 



Pintail 10 



Whistling Swan 5 



Greater Scaup Duck.... 11 



Field Sparrow 19 



Mallard 12 



Fox Sparrow 19 



Red-breasted Merganser. 11 



Belted Kingfisher 19 



Phoebe 19 



Merganser 5 



Turkey Vulture 18 



Vesper Sparrow 19 



Wilson's Snipe 19 



Chipping Sparrow 19 



Shoveller 8 



Lesser Scaup Duck 16 



