GREAT NORTHERN DIVER OR LOON. : 55 
dusky band across the vent, the lower tail-coverts, which are brownish- 
black tipped with white, and the axillar feathers and larger wing-co- 
verts, which have a dusky streak along the middle. The sides of the 
neck at its lower part are longitudinally’streaked with black and white, 
there being twe oblong spots of the latter on each feather towards the 
end. ‘The upper parts are glossy black, variegated with spots of white 
in regular transverse slightly-curved lines having the convexity back- 
wards. These spots vary in form and size, being small and roundish 
towards the neck and sides, larger and somewhat four-sided along the 
middle of the back: largest and rectangular on the scapulars, very 
small and roundish on the hind part of the back and tail-coverts. The 
upper part of the wing is similar, with smallish spots; the alula and 
quill brownish-black, a few of the inner secondaries only having two 
white spots at their extremity. Tail brownish-black, paler at the tip. 
Aduit Male. Adult Male. Young. 
Length to the end of tail, 3 322 36 311 
Bee ean ee ee Uae ota aaines claws, : 391 402 36 
Jeg ei eeawe As Gace aa sese) WILieSR ; dl — 29% 
2 cg LS a pea carpal joint, 163 _ 163 
Extent of wings, ? : ; 572 52 54i 
Wing from flexure, . ‘ : 15} — 142 
Depth of body, : i : aa 6 — 
Breadth, A : é ; et 91 wuld 
Bill along the ridge, s ; — 3y5 — 
Gape-line, : : 4 : _ 45 — 
Tarsus, 4 ; : ; = 375 — 
Hind toe, 2 ] é F — 93 — 
Its claw, ! 3 f : — 72: — 
Outer toe and claw, s ‘ — 4} — 
Middle toe, : : 3 : — 4 a 
Inner, ... 2 4 : : — 37% - 
Tail: : : : i — 2975 — 
Wing from flexure, : : —_— 143 — 
Weight, 5 : 8% 84 9 
The female is generally smaller, but in all other respects resembles 
the male. Weight 10 Ib. 11 oz. 
