200 MR. W. J. F. WILLIAMSON ON 



of tail-feathers extend beyond the others about 43 mm. ( 1.7 in. ).* 



Iris dark brown. Bill black. Mouth }-ellowish. Legs blackish 

 brown, soles paler. 



Distriliul.iuit, Recorded from all the divisions of the countrj", 

 except the Northern and Western ones, but it must occur in them also. 



llahits, etc. This bird is a seasonal visitor to Bangkok, and 

 occurs in great numbers from August to about the middle of Maj-, 

 but one year I saw two on the 23rd Ja\y. It is thus absent from 

 Bangkok for two or three months only. Gyldenstolpe remarks that the 

 bird is " a winter visitor to Siam," but I think there can be no doubt 

 that some, at least, of them remain to breed in this country. In 1916 

 I found the birds plentiful at Klong Ilangsit, a few miles north of 

 Bangkok, on the 29th May, and again observed a fair number on Koh 

 Pliai, an island in the iinier Uulf of Siam, on 17th July. 



The Eastern Swallow is one of our most familiar birds, and may 

 nearly always be looked for either on the wing, hawking for the 

 minute insects on which it feeds, or sitting in long rows on the electric 

 light wires along the road sides. As a rule it flies fairly low, and is 

 often to be seen skimming over the ground only a few feet above the 

 surface. This it usiually does over an open field, but I have fre(juently 

 observed it tlying in and out among the traffic, in the busiest 

 thoroughfares of the City. I have only noticed the Swallow on the 

 ground on one occasion, when a flock of them were disporting them- 

 selves on the road in front of the Wireless Station, and apparently 

 picking up the grit from the surface. 



Family MOTACILLID.IS—Wafjtails and P/'pits. 

 5t (827). Motacilla leucopsis Gould. The ]Vhite-Jaccil 

 Waijtall. 



Miitacilbt iilba leaaipsi.-; tiyldeiistolpe 1913 p. 41: iel. U'lO, p. 31. 

 BoscriiAion. Length 197 mm. (7'75 in.). Summer jdumcuje. 

 The whole upper plumage, including the lesser wing-coverts, deep 



* In one speciniKii, wliicii I obtaiiu'd on 9th Koveuiber 1914, tiie 

 liifiuvation of tlio tail was about 68 unn. (2.7 in.), and the tolal longtii of llie 

 bird 210 nun. (8 2 in.) — measurements \vl\iili ;\ppioxiniate to lliose of 7/. 

 iiistira. 1 iiiesciitod tills bird to one of the Musenms in (ireat Britain in 1915, 

 and have, unfoitiUKild)', no note as to wliellier tlie black pectoral band was 

 foiuplete or not, 



JOUKN. NAT. HIST. SOC. SUM, 



