22 



THE SEMI-ANNUAL. 



COMPOSITION OF NEST. 



The nest is made of dead grass plastered together with mud, 

 always lined with diy grass of a light color ; the grass very 

 rarely hides the mud. Weed stalks, rags, rootlets, paper, corn- 

 husks, or even small twigs may find their way into exterior of 

 nest occasionally. Mr. Ely has found nests with a few horse 

 hairs for lining. Robin's nests may be distinguished by the 

 absence of rootlets and the presence of grass in the lining. In 

 Iowa, where Wood Thrush uses punk instead of mud, the mud 

 also distinguishes the nest of Robin. 



DIMENSIONS AND WEIGHT OF NEST. 



DIAM. DEPTH. 



Outside. Inside. Outside. Inside. Weight. 



Berwyn, Pa. 

 Columbia, Pa. 

 Grinnell, Iowa. 



5.00 3.50 3.00 2.00 5-8 oz 



to to to to 



6.00 4.00 4.00 2.50 



3.50 2.75 4.00 2.50 I lb. 



5.00 3.50 3.00 2.00 



to to to to 



6-50 4-25 4-^5 2.40 



The nest is too compactly made to vary much in size. 



DATE OF NESTING. 





First. 



Last. 



Av. 



rime Buildii 



Berwyn, Pa. 



5-1 



6-26 



5-24 





Columbia, Pa. 



4-26 



7-10 







Perrineville, N. J. 



3-28 



8-20 



4-10 



5 days 



Wauwatosa, Wis. 



4-iS 



7-15 







Grinnell, Iowa. 



4-26 



7-3 



May 



6 days 



3-1 



3-20 



