736 Field Museum of Natural History — Zoology, Vol. IX. 



Eggs, 2 to 4. Size, about 2.40 x 1.82 ; dull white, scantily marked 

 with olive brown or cinnamon-brown. Bird, tail, rufous brown, no 

 white bars. Buteo borealis. 



Red-tailed Hawk. 



SECTION 2. NEST IN HOLE IN TREE, STUMP OR POST. 



PART I. EGGS LESS THAN i IN. LONG. 



Eggs, 5 to 8. Size, about .73 x .56 ; white, marked with pale rufous 

 brown or lavender brown. Siiia caroUnensis. 



White-breasted Nuthatch. 

 Eggs, 3 to 6. Size, about .90 x .69 ; pale cream-brown or buff white, 

 marked and streaked longitudinally with chocolate brown. 



Myiarchus crinitus. 

 Crested Flycatcher. 



PART 2. EGGS MORE THAN i IN. LONG. 



Eggs, 3 to 6. Size, about 1.16 x .82; pale bluish or greenish, marked 

 and scrawled with dark brown and black. Quiscalus quiscula ceneus. 



Bronzed Grackle. 

 Eggs, 3 to 7. Size, about 1.38 x 1.14; pale tawny brown or brown- 

 ish white, marked and speckled with various shades of brown. 



Falco sparuerius. 

 Sparrow Hawk. 



SECTION 3. NEST ABOUT DWELLINGS AND BARNS. 



PART I. EGGS LESS THAN i IN. LONG. 



Eggs, 4 to 6. Size, about .77 x .54 ; white, marked with cinnamon or 

 olive brown. The slight difference in size will usually distinguish these 

 eggs from those of next species. Bird, tail forked; belly, rufous brown. 



Hirundo erythrogastra. 



Barn Swallow. 



Eggs, 4 to 5. Size, about .81 x .55; white, marked with cinnamon 



or rufous brown; usually more pronounced than in preceding species. 



Bird, tail not forked; belly, white. Petrochelidon lunifrons. 



Cliff Swallow. 



PART 2, EGGS MORE THAN i IN. LONG. 



Eggs, 3 to 5. Size, about 1.12X.80; usually bluish green (un- 

 marked), rarely with irregular spots of reddish brown. 



Planesticus migratorius. 



Robin. 



Eggs, z. Size, about 1.20 x .85; pale olive buff or grayish white, 



thickly marked and speckled with brown and washed in places with 



purplish gray. Eggs sometimes deposited on roof of house, usually in 



fields. Chordeiles virginianus. 



Nighthawk. 



