212 PROCEEDINGS OF THE ACADEMY OF 



other details of structure, exactly as in demersus. Larger: about 

 21 inches long, standing 24 as mounted; chord of culmen, 2.30; 

 gape 2.90, tomia naked 2.25, antise to tip of bill 2.00, depth of bill 

 at base 1.00, width do. .15 ; nostrils an inch from end of antia? ; 

 wing about 8 ; tarsus, 1.50 ; middle toe and claw, 3.00 ; outer do., 2.66 ; 

 inner do., 2.00. Darker than average demersus; the cervical half- 

 collar and pectoral lateral horse-shoe-shaped water-line both per- 

 fect ; the perfect white line of the head starts at side of base of bill, 

 runs over eye, curves down behind ear, somewhat expands below 

 it, and then passes forward to the throat where it joins its fellow, 

 thus cutting off the dark collar from the general gular black. 



No. 15,656, Mus. Smiths. Inst., same locality and source as the 

 last, is also in adult condition, and perfectly similar to No. 15,669 

 in color, but smaller ; now it stands, as mounted, only about 1^ 

 feet, but seems to have been about 2 feet long. 



No. . . . Mus. Acad. Phila. Locality unknown. 



No. 1644, Mus. Acad. Phila. Straits of Magellan. Adult. 



No. 1514, Mus. Acad. Phila. " Amerique meridionale." 



No. . . . Mus. Bost. Soc, adult, Tierra del Fuego, U. S. Ex. Ex. 

 {Hyatt.) 



