THE SEMI-ANNUAL. 



13 



COMPOSITION OF NEST. 



All agree in most points, respecting the composition of the 

 Catbird's nest. First there is a layer of sticks through which 

 protrude — usually below — some light colored fine grass, covered 

 above with bark, then leaves and weeds and lined with dark 

 colored rootlets. At Berwyn, Pa., grape-vine or cedar bark is 

 used. There, ".nests differ only in the quantity of certain of the 

 above named materials used." Mr. Burns found one nest, in a 

 yard, with about 3 feet of white satin ribbon festooned about it. 

 In Iowa, where .there is no cedar, the bark of the American 

 linden is used- 



DIMENSIONS AND WEIGHT OF NEST. 



DIAM. DEPTH. 



Outside. Inside. Outside. Inside. Weight* 



Berwj'n, Pa., 

 Columbia, Pa., 

 Grinnell, Iowa, 



4.00 

 to 



2.50 

 to 



2.00 

 to 



1. 00 

 to 



■50 



to 



6.00 



3.00 



3.00 



1.50 



1.50 



6.00 



2-75 



5-50 



2-75 





3-75 

 to 



2.30 

 to 



3.00 



to 



1.50 

 to 





7.00 



2.90 



6.00 



2.00 





DATE OF NESTING. 



ARRIVAL. 





First. 



Last. 



Av. 



Time Building. 



First 



Common, 



Berwyn, Pa., 



5-25 



6-26 



6-6 





5-9 





Columbia, Pa., 



5-18 



610 





5-6 days 







Perrineville, N. J. 



6-2 (?) 





6-10 



5-6 days 







Pittsburgh, Pa., 



5-13 



7-15 



5-30 





5-J 



5-10 



Wauwatosa, Wis. 



5-15 



8-1 











Grinnell, Iowa. 



5-20 



7-8 



. 6-1 



5-10 days 



5-i 



5-4 



