_Characters._--Adult: A medium-sized dove with head and nape near "light Quaker drab" with a vinous tinge; chin and upper throat whitish becoming near "vinaceous buff" on lower throat and to near "vinaceous-faun" on breast and upper abdomen; lower abdomen, vent, and under tail-coverts white; tibia grayish; neck feathers dark with grayish centers and metallic greenish-slate edges; color near "Japan rose"; back, rump, upper tail-coverts, scapulars, upper wing-coverts, and inner secondaries dark "drab"; sides, upper wing coverts, outer secondaries, and under wing-coverts lead colored; primaries blackish edged with light gray; central tail feathers like back but paler, outer feathers of tail darker with brownish tinge on edges; outermost tail feathers blackish tipped with gray and with outer webs whitish; bill dark; feet reddish; iris orange. _Measurements._--Measurements of 15 adult males from Guam, Rota and Tinian: wing, 154-162 (158); tail, 127-135 (130); culmen, 16.2-18.1 (17.2); tarsus, 24-27 (25.5); of 10 adult females from Guam and Rota: wing, 150-162 (156); tail, 120-130 (127); culmen, 16.2-19.1 (17.5); tarsus, 24-26 (25). No differences in measurements were found between populations from Guam, Rota and Tinian. _Weights._--The author (1948:61) reports the weights of five adult males as 130-167 (152) and of six adult females as 135-159 (146). These birds were taken at Guam. _Specimens examined._--Total number, 27 (16 males, 11 females), as follows: Mariana Islands, USNM--Guam, 21 (Feb. 7, May 25, 26, June 9, July 6, 7, 10, 18, 23, Aug. 2, 11, Sept. 8, Oct. 8)--Rota, 4 (Oct. 18, 22, 23, Nov. 2)--Tinian, 2 (Oct. 24, 25). _Nesting._--The NAMRU2 party found evidences of nesting by this dove at Guam in February, March, April, and June. Nests were observed on May 29 and June 28. On the latter date a nest containing one nestling and one unhatched egg was found near Mount Santa Rosa. The nest was situated approximately five feet from the ground in a low bush. Two eggs taken by Necker at Rota on October 31, 1945, are white and measure 29.6 by 23.0 and 30.1 by 23.0. Strophlet (1946:538) observed a bird carrying nest materials at Guam on November 13. Hartert (1898:60) reports on nests found at Guam in April and May. Each nest contained one egg. It is probable that this bird nests at all times of the year. The nuptial flight of these birds reminds one very much of that of the mourning dove of North America.