Although records were made only infrequently in the spring migration, such information as was obtained indicates that the populations were largest in March and early April. On April 24, _Pluvialis dominica_ was the only bird observed on beaches and in upland openings. On April 26, a single _Limosa lapponica_ was recorded. On May 15, no shore bird was seen on a trip along several beaches. In late May and early June, single individuals of _Heteroscelus_ were found. Of this genus, those collected in May were in nuptial plumage, and those collected in June were in winter plumage and probably should be classed as non-migrants. _Numenius phaeopus_ was occasionally recorded beginning in early June, but waders were totally absent from beaches at Agfayan Bay and vicinity on June 18 and 19. Few shore birds were seen in early August. In late September, birds, especially _Pluvialis dominica_, _Numenius phaeopus_, and _Heteroscelus_ spp., were numerous. These species were numerous until October 24, when observations were discontinued. Of the 17 species of migratory shore birds recorded from the Mariana Islands, eight were identified. Of these eight, three species, _Limosa lapponica_, _Actitis hypoleucos_, and _Charadrius mongolus_, were found on only one occasion. Never more than four species were identified on a single field trip. These data give an idea of the lack of variety of species that may be observed on Micronesian islands. TABLE 9. POPULATIONS OF MIGRATORY SHORE BIRDS SEEN AT ULITHI ATOLL IN 1945 Column headings: Fas.: Fassari Man.: Mangejang Los.: Losiep