igi7-l H. C. Robinson: 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. 



I |. OCHTHODROMUS MONGOLUS PYRRHOTHORAX (Gould). 



Ochthodromus pyrrhothorax, Sharpe, torn. cit. p. 226: 

 A', bin ■■■■a ■nut Kloss, p. 12, Robinson, antea,vo\. V, p. 142 1 1915). 



Aegialitis mongolicus, Ogilvie, Grant. Fascic. Malay. 

 Zool. iii, p. ri8 (1906 . 



Ochthodromus mongolus, Gyldenstolpe, p. 144. 



a-b. .'. "■• . Koh Mule (Pulau Muntia) Trang, S. W. 

 Siam. 4th January 1917. Nos. 3843, 4. 



- Iris 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 longei tarsus. 



15. Aegialitis alexandrina peroni (Bp.) 



Aegialitis peroni] (Bp.) ; Sharpe, torn. cit. p. 274; 



Gyldenstolpe, p. 144. 

 Aegialitis alexandrina. Robinson, antea, vol. V, p. 142; 

 vol. VII, p. 70 (1916). 



a-b. 3 i ad. Burau, N. W. Langkawi, 23rd April, 

 1911. 

 . W. side Pulau Telibun, Trang, S. \Y. Siam. 

 2nd January. 1917. [No. ^ s 1 5 - J 

 " Iris dark hazel, bill black, feet slate." 



Until Gyldenstolpe, Hoc. 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. alexandrina, which indeed it is. 



Seven males from various part^ of the Peninsula have a 

 wing of 93-99 mm. and eight females 93-100 mm. 



A eries from Borneo, the loan of which we owe to the 

 kindness of the Sarawak Museum authorities has the wing in 

 four males 91-94 mm. and in three females (one very worn) 

 88-94 mm. so 'hat 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 an 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 separal 



