160 
Bidgway on a new Alaskan Sandpiper. 
Total length, about 10 to 12J. inches, extent 17j to 20|; wing, 5.30- 
6.00 (5.73); culmen, 2.00-3.00; tarsus, 1.25- 1.75 (1.5a); middle toe, 
.90-1.10 (1.00). 
Yar. griseus. 
Wing, 5.25-5.90 (5.65) ; culmen, 2.00-2.55 (2.30) ; tarsus, 1.20-1.55 
(1.35): middle toe, 0.90-1.05 (0.95).* Adult in summer: Abdomen 
whitish ; breast and sides speckled with dusky. 
Yar. scolopaceus. 
Wing, 5.40-6.00 (5.74); culmen, 2.10-3.00 (2.72) ; tarsus, 1.35-1.75 
(1.58) ; middle toe, 0.95 - 1.15 (l.Ol).f Adult in summer : Abdomen uni- 
form cinnamon, without markings ; breast speckled (usually scantily), and 
sides barred with dusky. 
ON A NEW ALASKAN SANDPIPER. 
BY ROBERT RIDGWAY. 
The various collectors of the National Museum in Alaska have 
sent from that country numerous specimens of a Sandpiper which 
in its winter plumage greatly resembles Arquatella maritima 
(Briinn.), but is very differently colored in its summer .dress. 
After much search among the older authors I have been unable to 
find a name for it, and therefore, since it ^appears to be new to 
science, take pleasure in dedicating it to the well-known author of 
an excellent “ Monograph of the North American Tringese,” J also 
the original describer of a kindred Alaskan species, the A. ptilo- 
cnemis of the Prybilov Islands. Following is a description of the 
new species : — 
Arquatella couesi, Ridgw. — The Aleutian Sandpiper. 
Sp. Ch. — Similar to A. maritima (Briinn.), but averaging slightly 
smaller, and the plumage appreciably different at all ages and seasons. 
Adult , breeding dress: Above fuliginous-slate, the feathers of the pileum 
broadly edged, those of the dorsal region (including the scapulars) widely 
bordered with rusty ochraceous, or bright cinnamon, (a few of the scapulars 
and interscapulars tipped with white in some specimens,) the central area 
of each feather nearly black, or much darker than the wings and rump ; 
lesser wing-coverts slightly, and middle coverts broadly, bordered terminally 
* Extremes and average of 18 fully adult specimens. 
t Extremes and average of 40 fully adult specimens. 
} Proc. Philad. Acad., 1861, pp. 170-205. 
