JAN., 1909. BIRDS OF ILLINOIS AND WISCONSIN CORY. 309 



Double-crested Cormorant . 



Genus PHALACROCORAX Brisson. 



32. Phalacrocorax auritus (LESSON). 

 DOUBLE-CRESTED CORMORANT. 



Phalacrocorax dilophus (Swain.), A. O. U. Check List, 1895, p. 42. 



Local name: Nigger Goose. 



Distr.: Eastern North America, breeding from the latitude of 

 Minnesota, Dakota, and the Bay of Fundy northward; south in 

 winter to the Gulf of Mexico. 



Adult in spring: Head, neck, and under parts, glossy black; scap- 

 ulars and wing coverts, brownish gray, edged with black; tail, black, 

 having 12 feathers; a tuft of black feathers over the eyes; gular sac 

 and lores, orange yellow. 



Adult in fall and winter: Similar, but lacking the tufts of feathers 

 on sides of head, and the gular sac varies in color. 



Immature: General plumage, grayish brown, becoming pale on the 

 breast, sometimes whitish; many of the back feathers and scapulars 

 with dark edges; no tufts of feathers on sides of head. 



Length, about 30; wing, 12 to 13.20; bill, 2.10 to 2.50. 



This species occurs in both Illinois and Wisconsin during the 

 migrations. It is not improbable that a few pairs may breed in 

 northern Wisconsin. Mr. Chas. F. Carr (Wisconsin Naturalist, Sept. 



