ANAS. 91 
Above olivaceous, relieved by two pairs of yellowish spots, 
one pair on the back, just behind the wings, the other on 
each side of the base of the tail; lower parts, including 
sides of head and broad superciliary stripe, yellowish buff, 
deepest on head, paler and duller posteriorly ; side of head 
marked by a narrow but very distinct stripe of dark 
brown, extending from upper basal angle of the maxilla 
to the eye, and thence to, and confluent with, the oliva- 
ceous of the occiput; beneath this stripe an auricular spot 
of dusky; sides crossed by two olivaceous patches, con- 
fluent with the olive of the back. Length about 20.00- 
25.00, wing 10.25-12.00, culmen 2.00-2.40, tarsus 1.50-1.80, 
middle toe 1.90-2.15. Eggs 2.32 x 1.67, pale olive-buff, 
pale greenish buff, or pale buffy pea-green. Hab. Whole of 
northern hemisphere. 
132. A. boschas Linn. Mallard. 
@. Smaller wing-coverts distinctly bordered or margined with buff 
or ochraceous, and tertials edged with same; sexes alike in 
plumage. 
e'. Wing without any white bands. 
fi. Cheeks, chin, and entire throat distinctly streaked with 
dusky ; dusky markings largely predominating in ex- 
tent over the lighter (buffy or ochraceous); lower 
basal corner of upper mandible without black spot; 
speculum usually deep violet. Downy young: Above 
olive-brown, slightly relieved by three pairs of light 
dull buff spots, as follows: One on posterior border 
of arm-wing (this sometimes indistinct), one on sides 
of back, just behind wing, and one on sides of rump, 
near base of tail; top of head and hind-neck olive- 
brown, like back, etc.; rest of head and neck, with 
lower parts, pale dingy buff, paler on belly; sides of 
head marked with a narrow dusky streak, from upper 
basal angle of bill to eye and thence back to occiput ; 
a dusky auricular spot, continued less distinctly back 
to nape. Length 21.00-24.50, wing 10.50-11.50, cul- 
men 2.00-2.35, tarsus 1.70-1.80, middle toe 1.90-2.10. 
Eggs 2.43 X 1.75, pale dull buff or pale greenish buff. 
Hab. Eastern North America, breeding from more 
northern United States to Hudson’s Bay, including 
whole ‘of Labrador. (Western and southern limits 
imperfectly determined.) 
133. A. obscura GmzL. Black Duck. 
f?. Cheeks, chin, and throat plain buff; ochraceous or buff 
markings predominating in extent over the darker 
