THE BIRDS OF SOUTH-WEST AND PENINSULAR SIAM. 61 



?. Koh Lak, S. W. Siam. 7 April, 1919. (No. 5139). 



" Iris dark ; bill black ; feet pale bluish slate, tinged green." 



The Sand-Plover occurs sparingly throughout the Malay 



Peninsula, and probably Siam, though not nearly as common as the 



following. 



67. Aegialitis mongolus (Pall.). 



Charadrius mongolus, Pall., Reis. Russ, Reichs, iii, 1776, p. 700 



(Russia). 

 Aegitditis mongolus, B., p. 455 ; C. ii, p. 368 ; E., p. 118 (Patani); 



I., p. 143 (Koh Lak). 

 Odithodromus pyrrhoihorax, F., p. 12 (Terutau); H., p. 142 (Koh 



Pemiau); J., p. 139 (Koh Muk). 

 C irrejndesmus geoffroyi, B., p. 83 (Junk Seylon). 



2 9. Koh Lak, S. W. Siam. 7 April, 1919. 



"Iris black; bill black; feet pale greenish grey with a tinge 

 of blue." 



Total lengh 182, 182; wing 128, 120; tail 48. 45; tarsus 33.5, 

 32.5 ; bill from gape 22, 20.5 mm. 



Two races of this Sand-Plover — a western one, Ae. ])yrrlio- 

 thorax, and the present one — are supposed to occur in our area : the 

 majority of specimens should perhaps be referred to the former, 

 which is stated to have a slightly longer tarsus. It is, however, 

 practically impossible to discriminate with any certainty individual 

 birds in winter plumage, and we have therefore retained all the local 

 birds under the older name. 



68. Aegialitis dubius curonicus (Gm.). 



Charadrius curonicus, Gm., Syst. Nat. i, pt. 2, 1788, p. 692 



(Curonia). 

 Aegialitis ciironicus, A., p. 456 (Pakchan). 

 Aegialitis mimitus, A., p. 456 (Assoon). 

 Aegialitis fluviatilis, B., p. 83 (Junk Seylon). 

 Aegialitis dubia, 0. ii, p. 370; E., p. 118 (Patani); G., p. 152 



(Ratburi and Petchaburi). 

 Aegialitis jerdoni, 0. ii, p. 371. 

 Aegialitis duhius curonicits, Hartei-t and Jackson, Ibis, 1915, p. 533. 



I- Gyldenstolpe, Kungl. Sv. Vet. Akad. Handl. M. Baker, Journ. N. H. Soc. Siam, iii, 1919. 



.56, No. 2, 1916. (first part). 



J. Robinson, Journ. F. M. S. Mus. vii, 1917 Baker. Journ N.H. Soc. Siam, iii, 1919. 



K. Kloss, Ibis, 1918. (second part). 



L. Robinson and Kloss, Journ. N. H. Soc. Siam, M. I. Baker, Journ. N.H. Soc. Siam, iv, 1920. 



iii, 1919. (third part). 



VOL. V, NO. 1, 1921, 



