172 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
Young.—Similar in coloration to adults but lacking the ornamental 
head plumes or else having them very slightly developed; bill smaller, 
much duller in color (dusky). 
Downy young.—Plain sooty grayish brown, paler on under parts, 
especially on abdomen. 
Adult male.—Wing, 104-111 (107.2); tail, 27.5-34 (29.9); exposed 
culmen, 7-10 (8.3); depth of bill at gonydeal angle, 7—7.5 (7.1) ; tarsus, 
19.5-23 (20.9); middle toe, 22-25 (24.1).2 
Adult female—Wing, 103.5-116 (109.1); tail, 27-30.5 (28.9); 
exposed culmen, 9; depth of bill at gonydeal angle, 7—7.5 (7.4); 
tarsus, 20-21 (20.4); middle toe, 24-24.5 (24.1).? 
Aleutian Islands, Alaska (as far eastward an Unalaska), Com- 
mander Islands, Kamchatka, and Kuril Islands, breeding; in winter 
southward to northern Japan; St. Lawrence Island, Bering Sea? 
[Alca] pygmxa Gmuewin, Syst. Nat., i, pt. ii, 1789, 555 (‘‘Bird Island, between 
Asia and America”; based on Pygmy Auk Pennant, Arctic Zool., ii, 1785, 
513). 
Alea pygmaea LicHTENSTEIN, Verz. Doubl., 1823, 89, in text. 
Plhaleris] pygymexus Gray, Gen. Birds, iii, 1848, 638. 
Simorrhynclus pygmexus Branvt, Mélang. Biol., vii, 1869, 228.—Ripeway, Proc. 
U.S. Nat. Mus., iii, 1880, 211 (Cat. N. Am. Birds, no. 749); Nom. N. Am. 
Birds, 1881, no. 749.—Covzs, Check List, 2d ed., 1882, no. 860.—Nzzson, 
Cruise ‘‘Corwin” in 1881 (1883), 116 (Aleutian Islands); Rep. N. H. Coll. 
Alaska, 1887, 42 (Nearer Islands, Aleutian chain, breeding but not wintering; 
Commander Islands, Kamchatka, breeding).—SrrsinecEerR; Naturen, 1884, 
35, 55; Bull. U. 8S. Nat. Mus., no. 29, 1885, pl. 4, figs. 1, 2, pl. 5, figs. 3, 4 
(Commander Islands); Proc. U. S. Nat. Mus., x, 1887, 118 (Commander 
Islands); xxi, 1898, 274 (Kuril Islands, breeding).—Turnzr, Auk, ii, 1885, 
159 (Attu Island, Aleutians, breeding); Contr. N. H. Alaska, 1886, 120, pl. 1 
@ Seven specimens. b Four specimens. 
‘Depth 
Ex- é 
of bill ‘ " 
Locality. Wing. | Tail. | Posed | at base Tat | shade 
men. gonys 
MALES, 
Two adult males from Alaska (Unalaska and Atka 
TS aNd) aasisrcciomarenteisisaeme ni ecm siseeea samamteamee 104.5 27.7 9 7 19.7 22.7 
Four adult males from Commander Islands, Kam- 
Cha ae: snisainn vinmcwien ats stiewseiaemnsat ean Auman Heist 107.6 30. 6 7.7 7 20.9 24.5 
One adult male from Kuril Islands............2-..+-.. 11 31 9.5 WS 23 25 
FEMALES, 
One adult female from Copper Island, Commander 
RLOWD ss cosnaenaemeneereeenaccemar ae sasinenwenenames 103.5 27 9 7.5 20 24.5 
Two adult females from Bering Island, Commander 
BlOUD aac ereewegunsg ore exe teNe Geedwemeeseeseee eee 108.5 29 9 2 20.2 24 
Lamas sieiswncee}, CLG 28 9 7.3 20.5 24 
