1917.| H. C. Ropinson: Birds from Pulau Langkawi. 139 
imply. It can generally be met with in Klang Straits during 
the months November to February and has also been noted at 
numerous other localities between Malacca and the Kedah 
River. 
I4. OCHTHODROMUS MONGOLUS PYRRHOTHORAX (Gould). 
Ochthodromus pyrrhothorax, Sharpe, tom. cit. p. 226; 
Robinson and Kloss, p. 12, Robinson, antea, vol. V, p. 142 (1915). 
Aegialitis mongolicus, Ogilvie, Grant. Fascic. Malay. 
Zool. ili, p. 118 (1906). 
Ochthodromus mongolus, Gyldenstolpe, p. 144. 
a—b. 2%. Koh Muk (Pulau Muntia) Trang, S. W. 
Siam. 4th January 1917. Nos. 3843, 4. 
“Tris dark hazel, bill black, feet dirty slate.” 
I am doubtful if the typical race of this plover, for this 
form is not more than a subspecies, is ever found west of North 
Borneo. I have certainly, with one very doubtful exception, 
seen none from any part of the Malay Peninsula, all being 
referable to the present race which, as Sharpe points out, has 
a slightly longer tarsus. 
15. AEGIALITIS ALEXANDRINA PERONI (Bp.) 
Aegialitis peronil (Bp.); Sharpe, tom. cit. p. 274; 
Gyldenstolpe, p. 144. 
Aegialitis alexandrina, Robinson, antea, vol. V, p. 142; 
vol. VII, p. 70 (1916). 
a—b. &? ad. Burau, N. W. Langkawi, 23rd April, 
IQII. 
c. ¢. W.side Pulau Telibun, Trang, S. W. Siam. 
2nd January, 1917. [No. 3815.] 
“Tris dark hazel, bill black, feet slate.” 
Until Gyldenstolpe, (Joc. cit.) identified a pair of plovers 
obtained at Koh Lak in Peninsular Siam as this species I had 
hitherto regarded our fairly considerable series as a tropical 
resident race of Ae. alexandvina, which indeed it is. 
Seven males from various parts of the Peninsula have a 
wing of 93-99 mm. and eight females 93-100 mm. 
A series from Borneo, the loan of which we owe to the 
kindness of the Sarawak Museum authorities has the wing in 
four males gI-g4 mm. and in three females (one very worn) 
88-94 mm. so that the Peninsular race would appear to be 
slightly larger. In addition the Peninsular birds have the 
dark loral streak much less strongly developed, while the 
feathers of the mantle are somewhat paler with lighter 
edgings; the white at the base of the inner primaries is also 
more extensive. Material from Java and from Timor, which 
is probably the typical locality, is however required before the 
mainland race can safely be separated. 
