Geographic range.—Breeds in Arctic regions of the Northern Hemisphere. Winters to Southern Hemisphere. In Micronesia: Mariana Islands—Guam; Caroline Islands—Ulithi; Marshall Islands—Jaluit.
Specimens examined.—Total number, 5 (2 males, 3 females), as follows: Mariana Islands, AMNH—Guam, 4 (Dec. 2-4); Caroline Islands, USNM, 1 (Aug. 21).
Remarks.—Stickney (1943:8, 9) summarizes the available information concerning the Sanderling in Oceania. The bird may be classed as a regular visitor in eastern Micronesia; the most western record is from Ulithi in the western Carolines. It has been recorded also at Guam and Jaluit.
The NAMRU2 party secured one Sanderling from a flock of approximately thirty birds containing this species and Charadrius mongolus stegmanni at Pau Island, Ulithi Atoll, on August 21, 1945.
Calidris tenuirostris (Horsfield)
Asiatic Knot
Totanus tenuirostris Horsfield, Trans. Linn. Soc. London, 13, pt. 1, 1821, p. 192. (Type locality, Java.)
Calidris tenuirostris Baker, Smithson. Misc. Coll., vol. 107, no. 15, 1948, p. 54 (Peleliu).
Geographic range.—Breeds in northeastern Siberia. Winters from India east to Malaysia and Australia. In Micronesia: Palau Islands—Peleliu.
Specimens examined.—Four males from Palau Islands, USNM—Peleliu (Sept. 16).