JAN., 1909. BIRDS OF ILLINOIS AND WISCONSIN CORY. 51 



Family PHALACROCORACID^. 

 Cormorants. 



Bill, hooked at tip, and less than twelve inches 

 long; bare skin at base of bill and chin; lores, bare ; 

 toes, four, all connected by webs ; tail feathers, stiff. 



Double-crested Cormorant. 



Mexican Cormorant. 



* GROUP 1. Wing, n to [5 inches long. 



Plumage, variable at different seasons; but wing, always over n 



inches long. Phalacrocorax auritns, and races. 



Double-crested Cormorant and Florida Cormorant. 



See Nos. 32 and 32a. 



* GROUP 2. Wing, less than 10.50 inches long. 



Adult: With white line bordering the bare skin on throat ; imma- 

 ture: showing throat pale, but white line not clearly denned. 



Phalacrocorax vigua mexicanus. 

 Mexican Cormorant. 



See No. 33. 



* For directions for measurement, see page 21. 



