496 ALCIDA# 
white ; secondaries edged with white which forms a narrow 
alar bar; primaries, greyish-black; tail (of 12 feathers), 
similar in colour; lower neck, breast, abdomen, and under 
tail-coverts, white ; over the eye is a small white patch. 
Adult female nuptial.—Similar to the male plumage. 
Adult winter, male and female.—Chin, lower portions 
of the cheeks, throat, sides and front of neck,’ white; other- 
wise similar to the nuptial plumage. 
Immature, male and female.—Resembles the adult 
winter-plumage, except that the feathers of the upper parts 
are not glossy. 
Beak. Blackish; short and strong. 
Fret. Brownish-green, with darker webs. 
IrtpEs. Light brown. 
AVERAGE MEASUREMENTS. 
ToTAL LENGTH 85 in. 
WING : aes ae inet AsO ore 
BEAK soe ae re ax (ORO Dae 
TARSO-METATARSUS So. Oe 
Eee ise 19) 5:25 oie 
' In spring and autumn these regions are mottled with black and 
white: I have several times picked up Common Guillemots showing this 
transitional stage of plumage. 
