22 



BULLETIN 1165, U. S. DEPAETMEIS'T OF AGRICULTURE. 



Table 7. — Relative abundance of the six species reported most abundant on areas sur- 

 veyed in the Northeastern and North Central States, showing the percentage of the total 

 bird population and the number of nesting pairs per hundred acres. 





Northeastern States. 



Species. 



1916 



1917 



1918 



1919 



1920 



Aver- 

 age. 



Relative abundance: 



Per 

 cent. 

 10.4 

 2.1 

 6.7 

 .5.3 

 1.8 

 5.4 



Pairs. 

 14- 

 3- 



9- 



7+ 

 2+ 

 7+ 



Per 



cent. 



10.8 



2.1 



10.8. 



4.1 



1.8 



6.4 



Pairs. 



11+ 

 2+ 



11+ 

 5+ 

 2- 

 6+ 



Per 

 cent. 

 8.9 

 1.5 

 11.3 

 4.1 

 0.7 

 4.9 



Pairs. 

 9- 

 2- 

 11+ 



4+ 

 1- 

 5- 



Per 

 cent. 

 4.0 

 1.5 

 3.3 

 2.1 

 0.4 

 1.7 



Pairs. 



7- 

 3- 

 6- 

 4- 

 1- 

 3- 



Per 

 cent. 

 7.3 

 1.1 

 6.4 

 4.2 

 0.5 

 2.8 



Pairs. 

 11- 

 2- 



9+ 

 6+ 

 1- 

 4+ 



Per 

 cent. 

 8.3 



Catbird 



1.7 





7.7 





3.9 





1.0 





4.3 



Average population per 100 acres: 



Pairs. 

 10+ 



Catbird 



2+ 



Son<' sparrow 



9+ 





5+ 





1+ 



English sparrow 



5 









North Central States. 



Species. 



1916 



1917 



1918 



1919 



1920 



Aver- 

 age. 





Per 



cent. 

 6.1 

 2.8 

 3.1 

 1.4 

 4.0 

 7.8 



Pairs. 



s+ 



4- 

 4+ 

 2- 

 6+ 

 10+ 



Per 

 cent. 

 6.4 

 2.9 

 3.1 

 1.3 

 3.4 

 10.1 



Pairs. 



8+ 

 3+ 

 4- 

 2 



4+ 

 13- 



Per 

 cent. 

 6.7 

 1.6 

 2.4 

 1.9 

 2.3 

 8.2 



Pairs. 

 10- 

 2+ 

 4- 

 3- 

 3+ 

 12+ 



Per 



cent. 

 5.9 

 2.8 

 2.2 

 1.2 

 6.2 

 6.9 



Pairs. 



8+ 

 4- 

 3+ 

 2- 

 8+ 

 9+ 



Per 

 cent. 

 5.9 

 2.5 

 3.0 

 1.8 

 4.3 

 10.5 



Pairs. 



7+ 

 3+ 

 4- 

 2+ 

 5+ 

 13- 



Per 



cent. 

 6.2 





2.5 



Song sparrow •. 



2.8 





1.5 





4,0 





8.7 



Average population per 100 acres: 



Robin. . . . 



Pairs. 

 8+ 



Catbird 



3+ 





3 





2 



Meadowlark 



5+ 





11+ 







In the States north of North Carolina and east of the Mississippi 

 River the robin is the most abundant species. Of some 200 reports 

 received from this part of the comitry during the past five years, only 

 6 do not record the robin; 4 of these deal with woodland and the 

 other 2 with the same tract of farm land in two successive years. 

 The densest robin population was found at Chevy Chase, Md., where 

 in 1916 31 pairs nested on 23 acres. This was in a residential dis- 

 trict in the suburbs of Washington, D. C, where the shade and 

 fruit trees about the houses furnished plenty of convenient nesting 

 sites and an abundant food supply. But on farm land, there were 

 found near Commack, N. Y., in 1916, 30 pairs nesting on 45 acres; 

 at Gettysburg, Pa., in the same year, 31 pairs on 40 acres; near 

 Geneva, N. Y., in 1918,48 pairs on 92 acres (nearly half of it in 

 orchard); and at Putnam, Conn., in 1920, 29 pairs on 60 acres. 

 Though in the North Central States the robin stands second in point 

 of abundance, when these records are combined with those from the 

 Northeastern States the robin becomes first for the whole region. 



