THE BIRDS OF NORTHERN THAILAND 191 



it is chiefly distinguished by its browner, less glossed, upperparts and 

 much broader white rump band. 



APUS AFFINIS SUBFURCATUS (Blyth) 



Malayan House Swift 



Cypselus subfurcatus Blyth, Journ. Asiat. Soc. Bengal, vol. 18, 1849, pp. 807-809 

 ("Malay Peninsula," fide Sclater, Ibis, 1892, p. 83; type locality usually re- 

 stricted to Pinang Island, one of the localities mentioned by Blyth). 



Micropus affinis subfurcatus, Deignan, Journ. Siani Soc. Nat. Hist. Suppl., 1931, 

 p. 163 (Chiang Mai) ; 1936, p. 91 (Chiang Mai, ? Doi Suthep, Doi Ang Ka). 



Above a small pond near Chiang Mai, August 10, 1929, I observed, 

 in company with palm swifts, between 15 and 25 white-rumped birds, 

 which were probably, but not certainly, of this species. The swifts 

 seen at the summit of Doi Suthep, May 11 and 12, 1935, and recorded 

 by me in 1936 under this name may well have belonged to the preceding 

 form, which had not yet been taken on that mountain. The house 

 swift, however, was found to be common between 4,000 and 5,500 feet 

 on Doi Ang Ka in the spring of 1931, and on May 2 no less than 8 

 specimens, 'breeding adults and unfledged young, were brought to me 

 by Karens. 



I was informed that the birds were breeding in considerable num- 

 bers on a precipice near the White Karen village called Ban Nong Lom. 

 The nestlings were obtained by shooting buckshot at the face of the 

 cliff to break off fragments of rock to which nests were attached. 

 These nests were not seen by me but were described as having the 

 shape of a shallow cup. Some of the nests held eggs, which were 

 shattered by the fall. 



My specimens of all ages had the irides dark brown; the eyelids 

 plumbeous; the bill black; the interior of the mouth pink; the tarsi 

 fleshy in front, white behind; the toes with the basal half fleshy, the 

 rest dark brown ; the soles white ; the claws blackish brown. 



The house swift is black with the chin and throat and a conspicuous 

 rump band white. From the preceding species it may perhaps be 

 recognizable by its lesser size and its only slightly forked tail. 



CYPSIURUS PARVUS INFUMATUS (Sclater) 



Malaysian Palm Swift 



Cypselus infumatus Sclater, Proc. Zool. Soc. London, 1865, p. 602 (Banjermassin, 

 southwest Borneo). 



Tacharnis batasinensis infumatus, de Schauensee, Proc. Acad. Nat. Sci. Philadel- 

 phia, 1929, p. 575 (Chiang Mai). 



Cypsiurus batassiensis infumatus, Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 

 1931, p. 163 (Chiang Mai) ; 1936, p. 91 (Chiang Mai).— Riley, U. S. Nat. Mus. 

 Bull. 172, 1938, p. 159 (Ban Nam Khian). 



Tachornis batassiensis infumatus, de Schauensee, Proc. Acad. Nat. Sci. Philadel- 

 phia, 1934, p. 266 ("North Siam"). 



