144 NILS GYLDENSTOLPE, ZOOLOGICAL RESULTS OF THE SWEDISH ZOOLOGICAL EXPEDITIONS TO SIAM. 



It was generally mixed up among the flocks of O. mongolus Pall. and Aegialites 

 ahxandrina Linn. 



The specimens obtained were all shot on a san dy beach, and all are in their winter 

 plumage. 



309. Ochthodromus mongolus. Pall. — The Lesser Sand Plover. 



Aegialites mongolica: Gyldenstolpe I p. 69. 

 Aegialites mongolicus: Grant p. 118. 



$ Koh Lak »»/« 1914 - L = 18 ° mm -; w = 136 mm - T = 53 mm.; C = 20 mm.; Tarsus = 30 

 mm. — Irides: brown. .Bill: black. Legs: greyish yellow. 



The Lesser Sand Plover is a winter visitor to the coasts of Siarn, but seems to be 

 rather rare and only a few specimens, probably belonging to this species, were observed. 

 The only one I obtained was shot on a sandy beach south of Koh Lak on the 29th of 

 November 1914. 



The allied form O. pyrrhothorax Gould. is very similar to O. mongolus Pall. 

 in its winter plumage, being only separated by its slightly longer tarsus. It probably 

 occurs in Siarn too. 



310. Aegialites dubia. Scop. — The Little Ringed Plover. 



Aegialites dubia: Williamson 1 p. 48; Gyldenstolpe II; Gyldenstolpe III p. 235; Grant p. 118; Gairdner p. 152. 



J 1 Koon Tan 2s / 4 1914. L — 152 mm.; W = 104 mm.; T = 55 mm ; C = 13 mm. — J 1 Koon Tan 

 3 % 1914. L = 145 mm.; W = 102 mm.; T = 58 mm.; C = 12 mm. — Irides: brown. Bill: black (base 

 of lower mandible yellow). Legs: light brown. 



I never found this Plover mixed up among the other kind of Sand Plovers which 

 occurred in large numbers along the coasts of the Gulf of Siarn. 



In the Northern parts of the country it was, however, not uncommon during the 

 winter months. It was found on the sandbars in the larger rivers and creeks. My 

 specimens were both obtained at the Meh Tha river where it passes through the Koon 

 Tan mountains. 



311. Aegialites peroni. Bp. — The Malay Sand Plover. 



J 1 Koh Lak 18 /i 2 1914. L = 143 mm.; W = 90 mm.; T = 43 mm.; C = 16 mm. — $ Koh Lak 

 18 /i2 1914. L = 145 mm.; AV = 99 mm.; T = 43 mm.; C = 16 mm. — $ Koh Lak "/u 1914. L = 150 

 mm.; W = 96 mm.; T = 45 mm.; C = 15 mm. — Irides: brownish black. Bill: black. Legs: greyish white. 



Three specimens of this rare bird which inhabits the Indo Malayan Archipelago 

 where obtained south of Koh Lak in December 1914. 



They occurred either single or in pairs and were never mixed up among the flocks 

 of the other kind of wading-birds such as A. dlexandrina Linn. or Ochthodromus geoffroyi 

 Wagl. which were rather common on the sandy beaches south of Koh Lak. 



As far as I know this is the first record of this bird from Siamese Territory and it has 

 never been recorded from the Malay Peninsula nor from Burma or Tenasserim. 



