25 



On the other hand, those species which show the greatest uni- 

 formity in time of arrival are the May migrants from farther south, 

 especially such as were abundant the first day on which they were 

 seen. 



The time of arrival of a species at the same station for a number 

 of years varies within certain limits according to tlie state of the 

 weather, temperature, etc., as has already been stated, though the 

 variation is often comparatively slight, especially in the case of spe- 

 cies arriving after April 1, as may be seen from the following table, 

 which gives the date of first occurrence of fifty species at German- 

 town, Pa., for eight consecutive years: 



Flicker 



Chimney Swift . , 

 Hummingbird . . 



Kingbird 



Crested Flycatcher. 



Pewee 



Wood Pewee . . . 

 Acadian Flycatcher 

 Red-winged Black- 

 bird 



Meadowlark . , . 

 Baltimore Oriole . 

 Purple Crackle. . 

 White-throated 



Sparrow. . . . 

 Chipping Sparrow. 

 Field Sparrow . . 

 Snowbird .... 



Chewink 



Indigo-bird . . . 

 Scarlet Tanager. . 

 Barn Swallow . . 

 Red-eyed Vireo. . 

 Black and White 



Warbler. . . . 

 Parula Warbler. . 

 Yellow Warbler . 

 Black-throated 



Blue Warbler. . 

 Myrtle Warbler. . 

 Magnolia Warbler. 

 Chestnut-sided 



Warbler. . . . 

 Bay-breasted 



Warbler. . , . 

 BlackpoU Warbler. 

 Black burnian 



Warbler. . . . 



1885. 1886. 1887. 1888. 1889. 1890. 1891. 1892 



Apr. 

 Apr. 

 Apr. 

 May 

 May 

 Apr. 

 May 

 May 



iMar. 4 



May 

 Mar. 



Sep. 

 Apr. 

 Apr. 

 Oct. 

 Apr. 

 May 

 May 

 Apr. 

 May 



Apr. 

 May 

 May 



Mav 

 May 

 May 



17 



Mar.24 

 Apr.23 

 May 12 

 May 11 

 May 12 

 Mar. 20 

 May 15 

 May 6 



Feb. 19 

 Feb. 10 

 May 4 

 Mar. 7 



May 10 



May 

 May 



Sep. 21 

 Apr. 9 

 Apr. 7 

 12|0ct. 2 

 22|Apr.23 

 May 1 1 

 May 12 

 Apr.l9 

 May 1 1 



May 4 

 Apr.22 

 May 4 



May 1 1 

 Apr. 10 

 May 16 



May 16 



May 11 

 May 7 



May 11 



Mar. 2 6 

 Apr.22 

 May 12 

 May 7 

 May 3 

 Mar.21 

 Apr.30 

 May 8 



Feb. 19 

 Mar.l9 

 May 2 

 Feb. 19 



Sep. 24 

 Apr. 8 

 Apr. 9 

 Oct. 6 

 Apr.27 

 May 7 

 May 5 

 Apr. 21 

 May 4 



Apr.27 

 May 5 

 May 2 



May 5 

 May 2 

 May 13 



May 6 



May 5 

 Mav 13 



Mar. 30 

 Apr.20 

 May 14 

 May 6 

 May 1 

 Mar.22 

 May 13 

 May 2 



Feb. 21 

 Mar.21 

 May 2 

 Feb. 21 



Sep. 24 

 Mar.31 

 Apr. 2 

 Sep. 29 

 Apr. 18 

 May 12 

 May 8 

 Apr. 12 

 Apr.29 



Apr.21 

 May 1 

 May 5 



May 1 

 Apr.25 

 May 6 



Apr.30 



May 15 

 May 10 



Mav 1 



Mar.28 

 Apr.l5 



May 6 

 May 8 

 Mar. 2 7 

 May 12 

 May 10 



Mar. 13 

 Mar. 14 

 May 7 

 Mar. 2 



Sep. 22 

 Mar. 2 9 

 Mar.29 

 Sep. 27 

 Apr. 11 

 May 12 

 May 9 

 Apr.22 

 May 5 



Apr.20 

 Apr.27 

 May 11 



May 5 

 Apr.20 

 May 10 



May 9 



May 10 

 May 10 



May 10 



Mar.26 Mar. 30 Apr. 2 

 Apr.22 Apr.l6 Apr.27 

 May 7 May 11 . . . 

 May 14 j May iJMay 4 

 May l! Apr.30 1. May 3 

 Mar.27'Mar.31 Apr. 3 

 May 14 May 6 May 17 

 . . . |Apr.25 . . . 



Mar.12lFeb.25 

 Mar.l2|Feb.23 

 May 1 May 1 

 Feb. 13 Feb. 18 



Sep. 21 

 Apr. 8 

 Mar. 13 

 Oct. 4 

 May 1 

 May 10 

 May 4 

 Apr.l9 

 Apr.30 



Apr.30 

 Apr.30 

 May 1 



May 3 

 Apr.27 

 May II 



May 2 



May 11 

 May 7 



Apr.28 



Apr.13 

 Mar. 15 

 Oct. 1 

 Apr.18 

 May 8 

 Apr.28 

 Apr. 19 

 May 2 



Apr.24 

 Apr.l9 

 May 8 



Apr.28 

 Apr.18 

 May 9 



May 2 



May 10 

 May 11 



Apr.24 



Mar.: 9 

 Mar. 17 

 May 3 

 Mar. 6 



Sep. 22 

 Apr. 4 

 Mar.26 



Apr.24 

 May 10 

 May 3 

 Apr.24 

 May 3 



May 1 

 Apr.30 

 May 4 



May 

 Apr. 

 May 



May 3 



May V 

 May 12 



