THE COMING OF THE CATBIRD. 



Ill 



Delaware from the west. The last two places to report arrivals were 

 situated farther up the river and some distance back from it. All 

 this confirms the general idea that in migrating most, if not all, of 

 the various land birds follow river valleys and invade the upland 

 districts, lying back from either side, by way of the smaller tributaries. 



Flicker 



Chimney swift 



Hummingbird 



Kingbird 



Crested flycatcher. . 



Pewee 



Wood pewee 



Red-winged black- 

 bird 



Meadow lark 



Baltimore oriole . . . 



Purple grackle 



Chipping sparrow. . 



Field sparrow 



Chewink 



Indigo bird 



Scarlet tanager 



Barn swallow 



Red-eyed vireo 



Black-and-white 

 warbler 



Yellow warbler .... 



Myrtle warbler .... 



Black-throated 

 green warbler . . . 



Ovenbird 



Maryland yellow 

 throat 



Chat 



Redstart 



Catbird 



Brown thrasher. . . . 



House wren 



Wood thrush 



Veery 



Hermit thrush. . . . . 



Robin 



Bluebird 



1885. 



April 10 

 April 22 

 April 29 

 May 6 

 May 2 

 April 3 

 May 6 



Mar. 4 



May 5 

 Mar. 16 

 April 8 

 April 11 

 April 22 

 May 16 

 May 9 

 April 22 

 May 7 



April 30 

 May 6 

 May 2 



1886. 



May 2 May 11 

 April 30 May 3 



Mar. 24 

 April 23 

 May 12 

 May 11 

 May 12 

 Mar. 20 

 May 15 



Feb. 19 

 Feb. 10 

 May 4 

 Mar. 7 

 April 9 

 April 7 

 April 23 

 May 11 

 May 12 

 April 19 

 May 11 



May 4 

 May 4 



April 10 



April 29 

 May 2 

 May 2 

 May 2 

 April 24 

 May 3 

 May 2 



April 13 

 Mar. 7 

 Mar. 18 



April 24 

 May 12 

 May 4 

 May 4 

 April 25 

 April 27 

 May 1 

 May 11 

 April 7 

 Mar. 10 



1887. 



Mar. 26 

 April 22 

 May 12 

 May 7 

 May 3 

 Mar. 21 

 April 30 



Feb. 19 

 Mar. 19 

 May 2 

 Feb. 19 

 April 8 

 April 9 

 April 27 

 May 7 

 May 5 

 April 21 

 May 4 



April 27 

 May 2 

 May 2 



May 5 

 April 29 



April 28 

 May 5 

 May 3 

 May 3 

 April 28 

 April 24 

 Mav 1 

 April 25 

 April 9 

 Feb. 28 

 Feb. 17 



1888. 



1889. 



Mar. 30 Mar. 28 

 April 20 April 15 

 May 14 

 May 6 

 May 1 



May 6 

 May 8 

 Mar. 22 jMar. 27 

 May 13 jMay 12 



Feb. 21 

 Mar. 21 

 May 2 

 Feb. 21 

 Mar. 31 

 April 2 

 April 18 

 May 12 

 May 8 

 April 12 

 April 29 



Mar. 13 

 Mar. 14 

 May 7 

 Mar. 2 

 Mar. 29 

 Mar. 29 

 April 1 1 

 May 12 

 May 9 

 April 22 

 May 5 



April 21 April 20 

 May 5 |May 11 

 April 25 April 20 



April 26 May 5 

 April 30 [May 3 



April 30 

 May 6 

 May 1 

 May 5 

 April 15 

 April 28 

 May 1 

 May 3 

 April 3 

 Feb. 19 

 Feb. 21 



May 6 

 May 11 



May 4 

 May 5 

 April 22 

 April 14 

 May 3 

 May 6 

 April 10 

 Mar. 7 

 Mar. 8 



1890. 



Mar. 26 

 April 22 

 May 7 

 May 14 

 May 1 

 Mar. 27 

 May 14 



Mar. 12 

 Mar. 12 

 May 1 

 Feb. 13 

 April 8 

 Mar. 13 

 May 1 

 May 10 

 May 4 

 April 19 

 April 30 



April 30 

 May 1 



April 27 



May 2 

 May 3 



April 30 

 May 5 

 May 3 

 May 5 

 April 30 

 April 30 

 April 80 

 May 2 

 April 13 

 Feb. 26 

 Feb. 23 



1891. 



1892. 



Mar. 30 April 2 



April 16 April 27 



May 11 



May 1 



April 30 



Mar. 31 



May 6 



Feb. 25 

 Feb. 23 

 May 1 

 Feb. 18 

 April 13 

 Mar. 1 5 

 April 18 

 May 8 

 April 28 

 April 19 

 2 



Mav 4 

 May 3 



April 3 

 May 17 



Mar. 9 

 Mar. 17 

 May 3 

 Mar. 6 

 April 4 

 Mar. 26 

 April 24 

 May 10 

 May 3 

 April 24 

 May 3 



April 24 May 1 

 May 8 jMay 4 

 April 18 April 7 



April 19 April 30 

 April 29 April 30 



May 1 

 May 10 

 April 29 

 May 4 

 April 19 

 April 19 

 April 23 

 April 28 

 April 12 

 Feb. 24 

 Feb. 17 



May 3 

 May 3 

 April 30 

 April 30 

 April 30 

 May 5 

 May 2 

 May 4 

 April 3 

 Mar. 9 

 Mar. 9 



The fact of greatest importance resulting from these observations 

 was that relating to temperature. It was found that there was always 

 a marked increase in the number of individuals of a given species fol- 

 lowing a warm wave of temperature as marked by a decided rise of 

 the thermometer. The following graphic representation, based on 

 the abundance from day to day of three common and easily observed 

 species — the brown thrasher, chipping sparrow, and flicker — affords 

 an interesting illustration of the relative movements of the two waves. 

 It will be understood that the numbers in the extreme left-hand 

 column refer to the relative abundance of individuals of the three 



