270 BULLETIN 186, UNITED STATES NATIONAL MUSEUM 



assumed that summer birds from our area are also of that race, and 

 I place here, accordingly, the female taken in June 1917 at Chiang 

 Mai by Williamson. Mayr, in describing stanfordi, records two spec- 

 imens from Doi Chiang Dao, December 14, and a third from Chiang 

 Mai, November 11. 



The bird of November 11 is molting remiges and rectrices. 



This form differs from the last in its larger size (wing length 128- 

 136 mm., against 120-124 mm.) ; its deeper chestnut-rufous rump band ; 

 its broader streaking below ; the presence of a large, glossy black spot 

 on the lower flanks where the feathers of rump and thighs meet. 



DELICHON URBICA WHITELEYI (Swinhoe) 



East Siberian House Martin 



C[helldon] whiteleyi Swinhoe, Proc. Zool. Soc. London, 1862 [=1863], p. 320 



(Peking, China). 

 Delichon urbica cashmeriensis [partim], Deignan, Journ. Siam Soc. Nat. Hist. 



Suppl., 1931, p. 153 (Chiang Mai [partim]). 

 Delichon urbica whiteleyi, Rogers and Deignan, Proc. Biol. Soc. Washington, 



1934, p. 91 (Chiang Mai). 

 Delichon urbica whiteleyi [partim], Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 



1936, p. 9S (Chiang Mai [partim] ) . 



I have twice taken the Siberian house martin on the Chiang Mai 

 plain : An immature male, March 20, 1931, and an adult male, January 

 23, 1937. 



House martins of one kind or another are irregularly common in 

 flocks at Chiang Mai from November 23 (1929) to March 20 (1931). 

 Since they are usually seen high in the sky and have never been 

 found roosting, too few specimens have been collected to give any 

 true idea of the status of the various forms present. 



My immature bird had the irides dark brown; the bill black; the 

 feet and toes (beneath the feathers) pale fleshy; the claws brown. 



The genus Delichon is an extraordinarily difficult group of small 

 swallows having the tail somewhat forked and the feet and toes 

 densely clothed with white feathers. The present form has the rump 

 and upper tail coverts (including the longest ones) white ; the remain- 

 ing upperparts steel blue; the entire underparts white; the under 

 wing coverts gray-brown, barred with dark brown and white in the 

 region of the carpal and carpometacarpal joints. 



DELICHON DASYPUS DASYPUS (Bonaparte) 



Japanese House Martin 



[Chelidon] dasypus "Temm." Bonaparte, Conspectus generum avium, vol. 1, 1850, 



p. 343 (Borneo, ex Temnrinck). 

 Delichon urbica cashmeriensis [partim], Deignan, Journ. Siam Soc. Nat. Hist. 



Suppl. 1931, p. 153 (Chiang Mai [partim] ). 

 Delichon urbica whiteleyi [partim], Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 



1936, p. 98 (Chiang Mai [partim]). 



