BIRDS — ANAT1NAE — ANAS. 
773 
Comparative measurements of species. 
Dafila acuta . . . 
..Ad° 
Nettion Caroline 
Nettion en cca 
Querqueilula discors. 
Querquedula cyanoptera 
do 
Spatula elypeata 
Spatula macule 
Anas strepera.. 
Maroca ntm-rirana 
dn 
do 
Mareca penelope. 
Aix sponsa 
Boca Grande, Me 
San Jose, Cal. 
.do. 
Soutli America . 
Bodega, Cal 
San Jose, Cal... 
Carlisle, Pa 
.30 
.75 37. (JO 
32 25 
31.75 
10.82 
11.00 
10.60 
11.00 
11 46 
10.50 
10.50 
11.00 
6.90 
7.50 
4.16 
8.60 
3.42 
3.06 
2 66 
3.52 
3.80 
4.44 
3.96 
4.20 
5.24 
4.54 
5.14 
Middle Its claw 
2.40 
2.28 
1.72 
1.76 
1.70 
0.32 
0.34 
0.36 
0.31 
0.40 
1.41 
1.30 
1.52 
1.40 
2.00 
1.96 
2.10 
2.10 
2.10 
0.36 
0.34 
0.34 
0.33 
0.34 
2.02 
1.76 
1.45 
2.58 
2.42 
1.72 
ANAS, Linnaeus, 
Jlnas, Linnaeus, Syst. Nat. 1735. Type Anas boschas, L. (Gray.) 
Ch — Bill longer than the head or the foot, broad, depressed ; the edges parallel to near the end, which is somewhat acute. 
Nail less than one-third the width of the bill. Nostrils reaching to end of the basal two-fil ths of the commissure. Feathers of fore- 
head ,|chin, and cheeks, reaching about the same point; upper angle of bill about in line with the lower. Tail pointed, about two- 
fifths the wing. 
The genus Anas embraces very large species, among them the original of the domestic duck. 
The characters of the two North American species are as follows : 
A. Ends of greater wing coverts white, tipped with black ; speculum purplish violet, termi- 
nated with black. 
Head and neck green, succeeded by a white ring. Breast dark chestnut. Under parts and 
scapulars gray, finely undulated with dusky. Tail white, the coverts black.. A. boschas. 
B. "Wing black, the speculum purplish violet, tipped with black. 
Entirely dusky ; the head and neck brownish yellow, spotted with dark brown, which is 
uniform on the top of head and nape ; sides of nape with a greenish gloss. No white 
anywhere except on the axillars and inside of wing .A. obscura. 
