Jan., 1909. Birds of Illinois and Wisconsin — Cory. 737 



SECTION 4. NEST IN OPEN FIELDS ON GROUND OR 

 IN BUNCH OF GRASS. 



Eggs, 4 to 5. Size, about .73 x.56; white, speckled and spotted 

 with reddish brown, occasionally showing small markings of black and 

 dull lavender. Bird, no stripes on throat or breast; belly, white. 



Coturniculus savannarum australis. 



Grasshopper Sparrow. Yellow-winged Sparrow. 



Eggs, 4 to 5. Size, about .77X.S6; dull white or bluish white, 



thickly marked (somtimes washed) with cinnamon-brown or dull 



rufous brown, nearly obscuring the ground color. Bird, breast striped. 



a tinge of yellow over the eye. Passerculus sandwichensis savanna. 



Savanna Sparrow. 

 Eggs, 4 to 5. Size, about .78 x .60; white or bluish white, irregu- 

 larly marked with rufous brown. Bird, breast heavily streaked with 

 dark brown. Melospiza melodia. 



Song Sparrow. 

 Eggs, 4 to 6. Size, about .82 x .61 ; white or pinkish white, marked 

 and scrawled with black and pale purplish brown. 



Pocecetes gramineus. 



Vesper Sparrow. Bay-winged Bunting. 



Eggs, 4 to 7. Size, about .84 x .62; grayish white or dull white, 



with a few large blotches of Vandyke brown and scattered dots of black 



and dull brown. Dolichonyx oryzivorus. 



Bobolink. 



Eggs, usually i or 2. Size, about .87X.66; deposited in some 



other bird's nest. Color, white or pale buff, marked all over with 



irregular spots of brown. Molothrus ater. 



Cowhird. 



Eggs, 4 to 6. Size, about 1.12 x .80; white, sparsely marked and 



speckled with brown and lilac-gray. The size will distinguish eggs of 



this species from others in this section. Sturnella magna (or races). 



Meadowlark. 

 Eggs, 2. Size, about 1.20X.85; pale olive buff or grayish white, 

 thickly marked and speckled with brown and washed in places with 

 purplish gray. Eggs deposited on ground or on a rock. 



Chordeiles virginianus. 

 Nighthawk. 



SECTION 5. NEST ON GROUND IN WOODS IN DRY 



PLACES. 



PART I. EGGS LESS THAN i IN. LONG. 



Eggs, 4- to 5. Size, about .80 X .62 ; white, speckled and spotted 

 with cinnamon-brown, rufous brown, or lilac-gray markings. Nest, 

 of good size, made of leaves and grasses, usually covered over, with 

 entrance on side. Seiurus aurocapillus. 



Oven-bird. 



