_Gallinula chloropus guami_ Hartert, Novit. Zool., 24, 1917, p.
268. Type locality, Guam).
_Fulica chloropus_ Quoy and Gaimard, Voy. "Uranie," Zool., 1824,
p. 703 (Guam); Kittlitz, Obser. Zool., in Lutké, Voy. "Le
Séniavine," 3, 1836, p. 305 (Guahan).
_Gallinula galeata_ var. _sandwichensis_ Oustalet, Nouv. Arch.
Mus. Hist. Nat. Paris, (3), 8, 1896, p. 34 (Saypan, Tinian, Guam).
_Gallinula chloropus_ Hartert, Novit. Zool., 5, 1898, p. 62
(Guam); Seale, Occ. Papers Bernice P. Bishop Mus., 1, 1901, p. 31
(Guam); Safford, Osprey, 1902, p. 67 (Marianas); _idem_, Amer.
Anthro., 4, 1902, p. 711 (Guam); _idem_, The Plant World, 7, 1904,
p. 265 (Guam); _idem_, Contr. U. S. Nat. Herb., 9, 1905, p. 79
(Guam); Prowazek, Die deutschen Marianen, 1913, p. 101 (Marianen);
Cox, Island of Guam, 1917, p. 21 (Guam); Wetmore, in Townsend and
Wetmore, Bull. Mus. Comp. Zoöl., 63, 1919, p. 177 (Guam);
Strophlet, Auk, 63, 1946, p. 536 (Guam).
_Gallinula chloropus guami_ Hartert, Vögel pal. Fauna, 15, 1921,
p. 1843 (Guam); Kuroda, Avifauna Riu Kiu, 1925, p. 199 (Guam);
Kuroda, in Momiyama, Birds Micronesia, 1922, p. 43 (Guam, Tinian,
Saipan); Mathews, Syst. Avium Australasianarum, 1, 1927, p. 99
(Mariana Islands); Takatsukasa and Yamashina, Dobutsu. Zasshi, 44,
1932, p. 226 (Pagan); Hand-list Japanese Birds, rev., 1932, p. 197
(Guam, Tinian, Saipan, Pagan); Hachisuka, Birds Philippine
Islands, 1, 1932, p. 241 (Guam); Peters, Checklist Birds World, 2,
1934, p. 204 (Marianne Islands); Bryan, Guam. Rec., vol. 13, no.
2, 1936, p. 15 (Guam); Hand-list Japanese Birds, 3d ed., 1942, p.
222 (Guam, Tinian, Saipan, Pagan); Mayr, Birds Southwest Pacific,
1945, p. 288 (Marianas); Downs, Trans. Kansas Acad. Sci., 49,
1946, p. 92 (Tinian); Stott, Auk, 1947, p. 525 (Saipan); Baker,
Smithson. Misc. Coll., vol. 107, no. 15, 1948, p. 49 (Guam,
Tinian, Saipan).
_Geographic range._--Micronesia: Mariana Islands--Pagan, Saipan,
Tinian, Guam.
_Characters._--Adult: Head and neck sooty black; upper back dark,
bluish slate-gray; lower back and wing-coverts brownish; tail
blackish-brown; wings dark brown, outer edge of first primary
white; breast and upper abdomen dark slate-gray, feathers on sides
of breast with longitudinal white streak; under wing dark with
white edges; lower abdomen grayish with white-tipped feathers;
vent black; under tail-coverts white; bill and frontal shield red,
tip of bill yellowish; legs and feet olive-green.
Adult female: Resembles adult male but usually with smaller
frontal shield.
Immature: Resembles adult, but forehead mottled white and brown,
with sides of head less distinctly speckled with brown; crown,
neck and upper back dusky brown; back, scapulars and upper
tail-coverts olivaceous-brown; chin and throat whitish; breast
feathers pearly-gray tipped with white; abdomen white; sides gray,
washed with buff. Older birds are darker above and more
brownish-gray below; frontal shield small.
_G. c. guami_ resembles _G. c. indica_, but upper wing-coverts
darker and near "olivaceous black"; back, rump and scapulars
darker and less olivaceous brown, although not so dark as in _G.
c. orientalis_. From _G. c. lozanoi_, _G. c. guami_ differs in:
slightly darker upper wing-coverts; richer olivaceous-brown on
back, scapulars and rump; thinner culmen with possibly less yellow
coloring on tip. _G. c. guami_ resembles _G. c. sandvicensis_
Streets of the Hawaiian Islands, but has less olive wash on the
feathers and a smaller frontal shield.
_Measurements._--Measurements of _Gallinula chloropus_ are
presented in table 18. In general, females are smaller than males.