chestnut, which extends a little way down the sides of upper breast; under wing-coverts, axillars, and quill-lining white. Length, 215; culmen, 25; wing, 140; tail, 51; tarsus, 37. "Adult in winter plumage.--Differs from the summer plumage in wanting the rufous chest and in the absence of all facial markings. Above uniform brown, head like the back, hind neck paler and more ashy brown; lores, forehead, eyelid, and a broad eyebrow white; feathers below eye brown extending in a streak along ear-coverts; cheeks and entire under surface white, with a patch of brown on each side of upper breast. 'Bill black; tarsus greenish gray or pale olive; toes dusky or blackish; iris brown.' (Hume.) "Young.--Similar to the adults in winter plumage, but dark brown, with faint edges of sandy buff to the feathers of upper surface; eyebrow and sides of face washed with sandy rufous, a strong shade of which color pervades chest and sides of upper breast." (Sharpe.) In winter plumage Ochthodromus geoffroyi and O. mongolus are very similar but the former may be recognized by its larger size and longer bill. In a male the wing measures 136; tail, 57; exposed culmen, 24; tarsus, 36; middle toe with claw, 24. Wing of a female, 140; tail, 55; exposed culmen, 24; tarsus, 37; middle toe with claw, 23. 93. OCHTHODROMUS MONGOLUS (Pallas). LESSER SAND PLOVER. Charadrius mongolus Pallas, Reise Russ. Reichs (1776), 3, 700. Ochthodromus mongolus Sharpe, Cat. Birds Brit. Mus. (1896), 24, 223; Hand-List (1899), 1, 153; McGregor and Worcester, Hand-List (1906), 23. Ægialitis mongolica Grant, Ibis (1896), 126. Basilan (McGregor); Batan (McGregor); Bohol (Everett); Cagayancillo (McGregor); Calayan (McGregor); Cebu (McGregor); Cuyo (McGregor); Leyte (Everett); Lubang (McGregor); Luzon (Whitehead, McGregor); Mindanao (Mearns); Mindoro (Porter); Negros (Bourns & Worcester); Palawan (Platen, Whitehead); Ticao (McGregor). Northern Asia, south in winter to China, Malay Archipelago, and Australia. "Adult in breeding plumage.--Similar to O. geoffroyi, but smaller, bill and tarsus much shorter; a broader black line along sides of face; ear-coverts entirely black; the white throat separated from the rufous chest-band by a narrowly indicated line of black. 'Bill black; feet somewhat bluish black, toes darker; iris dark brown.' (Stejneger.) Length, 190; culmen, 19; wing, 127; tail, 53; tarsus, 30. "Adult female in summer plumage.--Similar to the male, but less richly colored; rufous chest-band never so pronounced; facial markings less developed, the black bands on the forehead often obsolete. 'Bill black; feet dark gray, with an olive tinge; toes darker, blackish; iris dark hazel.' (Stejneger.) Length, 178; culmen, 20; wing, 140; tail; 47; tarsus, 30.