SUMMER GROUP BLACK LIST 29 



til. PURPLE CRACKLE: CROW BLACKBIRD. 



Iridescent black. 



12-13. Iridescent with green and purple ; eye, creamy; 

 ? smaller, blackish-brown, and more or less lustrous. 



Breeds throughout, but more abundant northerly; gregarious,* 

 nest, large and coarse, commonly with mud, m bush or tree, the lat- 

 ter usually evergreen ; eggs, latter part of May, 4-5, very variable ; 

 one of first to arrive in spring ; winters rarely in S. Pa. and S. N. J. 



32, COW-BIRD: COW BLACKBIRD. 



Iridescent black. 



7)4' Head and neck, dark chocolate ; ? , smaller, brown 

 throughout, lighter below. 



Polygamous, parasitic, and gregarious ; eggs, laid in nests of other 

 birds from April on, probably 4-5, apparently irregularly, white, 

 finely speckled with brown and pale lilac. 



33. PURPLE MARTIN. 



Lustrous blue-black. 



7. 5 Duller above, somewhat whitish below, with dark- 

 gray streaks. 



Nest, formerly in tree-holes, now in boxes, etc., like white-breasted 

 swallow ; eggs, 4-5, in May, pure white. 



34. CHIMNEY SWIFT: CHIMNEY SWALLOW. 



Blackish (sooty brown). 



5. Throat, gray; wings, black; below, lighter. 



Nest, of twigs glued together with the bird's saliva, and attached 

 to interior of chimneys ; remote from human habitation it nests in 

 hollow trees, where possibly it sometimes hibernates ! eggs, 4, pure 

 white. 



