92 REPORT OF NEW JERSEY STATE MUSEUM. 



163 Oidemia americana Swainson. 

 Scoter, Coot Duck. 



Adult male. Length, 17-21. Wing, 8.75-9.50. Entire plumage black ; basal 

 half of upper mandible and knob at base, yellow ; rest of bill, black. 



Adult female and young in first winter. Dusky grayish-brown above ; gray- 

 brown below ; bill, dull black. 



Common winter resident and abundant transient off the shore be- 

 yond the breakers, occasionally driven into the bays or thoroughfares. 



165 Oidemia deglandi Bonaparte. 

 White- winged Scoter. 



Adult male. Length, 20-23. Wing, 11-11.40. Black, more or less tinged 

 with brown ; a pure white speculum, and a white patch on the ear-coverts ; 

 sides of bill, orange-red. 



Adult female. Similar, but browner, with a white wing speculum, but no 

 white on the head. 



Common winter resident, occurring with the other species. It is 

 difficult to ascertain their relative abundance. 



166 Oidemia perspicillata (Linnaeus). 

 Surf Scoter. 



Adult male. Length, 20-22. Wing, 9.50. Black, with a pure white trian- 

 gular patch on the forehead, and a larger patch on the back of the neck ; bill, 

 red, with a large black spot on the swollen part on each side near the base. 



Adult female. General plumage, grayish-brown or dusky, indistinctly mot- 

 tled with lighter below ; a little white at the base of the bill ; bill not swollen. 



Young male in first winter. Similar to the female, but whiter beneath, with 

 two dull white patches on each side of the head. 



Common winter resident with the other species of Scoter. 



