Indian Ocean area: Seychelles, | 20 | 276 | 154 | 41 Aldebra, Providence, Somaliland | | 270-286 | 146-164 | 39-42 --------------------------------------+-----+---------+---------+-------- _Geographic range._--Islands in the Indian Ocean east to tropical parts of western and central Pacific. In Micronesia: Mariana Islands--Agrihan, Asuncion, Saipan, Rota, Guam; Palau Islands--Kayangel, Babelthuap, Koror, Urukthapel, Ngabad, Peleliu, Angaur; Caroline Islands--Ulithi, Truk, Wolea, Mortlock, Lukunor, Nukuoro, Ponapé, Kusaie; Marshall Islands--Jaluit, Mille, Aurh, Wotze, Bikini, Kwajalein. _Characters._--Adult: A large, dark-brown tern with grayish crown and whitish forehead; line above eye white; crescent of white on lower eyelid; lores blackish; bill black; feet brownish, iris dark. Immature: Resembles adult, but lighter and browner and top of head grayish-brown. _A. s. pileatus_ resembles _A. s. ridgwayi_, but darker and less brownish, although not so dark as _A. s. galapagensis_; forehead and crown usually duller; length of wing and tail average larger (282 and 161) than in _A. s. ridgwayi_ (278 and 158) and _A. s. galapagensis_ (277 and 151). _Measurements._--Measurements of the Common Noddy of the Pacific area are listed in table 21. _Weights._--In 1948 (1948:56) I listed the weights of specimens from Guam and Rota as follows: four adult males 187-204 (197); three adult females 177-203 (189). _Specimens examined._--Total number, 92 (43 males, 39 females, 10 unsexed), as follows: Mariana Islands, USNM--Guam, 7 (May 24, June 15, July 6, 21)--Rota, 3 (Oct. 18, 24); AMNH--Guam, 4 (April 21, 27, Aug. 18)--Asuncion, 1 (Jan. 18); Palau Islands, USNM--Peleliu, 2 (Sept. 1)--Ngabad, 1 (Sept. 11); AMNH--exact locality not given, 6 (Nov. 3, 8); Caroline Islands, USNM--Ulithi, 3 (Aug. 15)--Kusaie, 1 (Feb. 8); AMNH--Truk, 15 (Feb. 1, 8, 25, March 10, May 6, June 12, 13, Nov. 25, Dec. 25)--Ponapé, 20 (Dec. 3, 5, 8, 12, 15)--Kusaie, 24 (Jan., March 10-30, April 1-10); Marshall Islands, USNM--Bikini, 5 (Feb. 28, March 2, 19).