THE BIRDS OF NORTHERN THAILAND 269 



Ping (south to the northern entrance of the Gorges) and on the moun- 

 tains to 5,500 feet. Mayr has shown (Ibis, 1941, pp. 367-370) that at 

 least two races, separable only in fresh adult plumage, occur in our 

 area and, of 12 such specimens examined by him, 9 collected between 

 November 12 and January 6 (Chiang Rai, Chiang Mai, Chom Thong) 

 belonged to the present form. I place here also (with reservations) 

 immature examples taken between November 12 and February 10 at 

 Chiang Mai, Chom Thong, Ban Sop Mae Chaem, Ban Mae Klang, and 

 on Doi Ang Ka at 3,500 feet. It is probable that substriolata is merely 

 a winter visitor and that all striated swallows seen late in spring and 

 during summer are of the following (presumably resident) race. 



This species, as seen in our provinces, differs from other swallows 

 chiefly in its habit of roosting in great numbers on telegraph lines, 

 rather than among the reeds. 



Two adults from Chom Thong, November 12, are molting remiges 

 and rectrices. Immatures taken between November 12 and December 

 7 are molting the body feathers. 



Specimens collected by de Schauensee (1929) had the irides brown; 

 the bill black ; the feet and toes horny brown. 



The adult has the upperparts, except for a conspicuous chestnut- 

 rufous rump band, steel blue ; a narrow superciliary line and the sides 

 of the neck chestnut-rufous; the entire underparts (except for the 

 black longer under tail coverts) white, suffused with salmon-buff and 

 everywhere heavily streaked with black. The immature differs in hav- 

 ing the upperparts unglossed brown and the chestnut-rufous areas 

 paler. 



Mayr observes (loc. tit., p. 369) : "Birds from North Siam are 

 slightly more narrowly streaked below and have longer tails . . . 

 They are best included with substriolata until more material of the 

 latter is known." 



HIRUNDO STRIOLATA STANFORDI Mayr 



Upper Burmese Striated Swallow 



Hirundo striolata stanfordi Mate, Ibis, 1941, p. 367 (Tamu, Myitkyina district, 



Upper Burma). 

 Hirundo striolata, Williamson, Journ. Nat. Hist. Soc. Siam, 1918, p. 23 (Chiang 



Mai). 

 Chelidon daurica striolata, Gyldenstolpe, Ibis, 1920, p. 579 (Chiang Rai, error 



[= Chiang Mai]). 

 Hirundo daurica nipalensis [partim], Deignan, Journ. Siam Soc. Nat. Hist. 



Suppl., 1931, p. 153 (Chiang Mai [partim], Doi Suthep [partim]) ; 1936, p. 



99 (Chiang Mai [partim], Doi Suthep [partim]). 

 Hirundo daurica striolata, de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 



1934, p. 237 (Doi Chiang Dao). — Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 



1936, p. 99 (Chiang Mai). 



From the fact that an example from Muang Ngoi, Laos, June 10, 

 was found by Mayr to be nearest stanfordi, it may for the present be 



