KED-THKOATED DIVEK 513 



DESCRIPTIVE CHARACTERS. 



PLUMAGE. Adult male nuptial. Top of head, greyish- 

 black ; back of neck, slate-grey, streaked with white ; sides 

 of neck and head, lighter grey ; fore-neck, marked with an 

 elongated rich reddish-brown patch, the chin and throat 

 above it being grey ; back, scapulars, wings, rump, and 

 upper tail-coverts, ash-brown, faintly glossed with green ; 

 breast and abdomen, white ; primaries, tail, flanks, and 

 under tail-coverts, chiefly brownish. 



Adult female nuptial. Similar in plumage to the male. 



Adult winter, male and female. The red of the throat is 

 absent; back, scapulars, wings, rump, and upper tail-coverts, 

 ash-brown, spotted and streaked with white ; sides of the 

 face, chin, throat, fore-neck, breast, and abdomen, white. 



Immature, male and female. Resembles the adult winter- 

 plumage, but the feathers of the upper parts are edged 

 white, and the fore-neck is white freckled with brown. 



BEAK. Black. 



EEET. Greenish-black. 



IRIDES. Dark brown or hazel. 



AVERAGE MEASUREMENTS. 



TOTAL LENGTH ... ... ... 24 in. 



WING ... 11-2 



BEAK 2'4 



TARSO-METATARSUS ... ... 3 ,, 



EGG 2'75 X 1'8 in. 



Note. Mr. Harting, in his ' Handbook of British Birds,' 

 2nd Edit., 1901, p. 266, mentions a white variety of this 

 Diver. It was obtained in Essex (vide also ' Zoologist,' 

 1862, p. 8002). 



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