RED-THROATED DIVER 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. 
Brak. Black. 
FrEEr. Greenish-black. 
Irtes. Dark brown or hazel. 
AYERAGE MEASUREMENTS. 
TOTAL LENGTH ... ite Sha 24s ie 
WING ye aot . ead ae 
BEAK ae sats nas Bay ee ee 
T'ARSO-METATARSUS fe SEO ee 
EGG Ae cee ee ae) 2 TO <8 am 
Note.—Mr. Harting, in his ‘ Handbook of British Birds,’ 
2nd EKdit., 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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