272 BULLETIN 186, UNITED STATES NATIONAL MUSEUM 

 RIPARIA CONCOLOR SINTAUNGENSIS (Stuart Baker) 



Eastern Dusky Crag Martin 



Krimnochelidon concolor sintaungensis Stuart Baker, Bull. Brit. Om. Club, vol. 

 54, 1933, p. 24 (Sintaung, Southern Shan States). 



Krimnochelidon concolor, Riley, Journ. Siam Soc. Nat. Hist. Suppl., 1933, p. 155 

 (Doi Langka). 



Krimnochelidon concolor sitaungensis, de Sohauensee, Proc. Acad. Nat. Sci. Phil- 

 adelphia, 1934, p. 237 (Doi Chiang Dao, Doi Suthep). — Deignan, Journ. 

 Siam Soc. Nat. Hist. Suppl., 1936, p. 99 (Doi Suthep, Doi Chiang Dao). 



Krimnochelidon concolor sintaugensis, Riley, U. S. Nat. Mus. Bull. 172, 1938, 

 p. 264 (Doi Langka, Doi Hua Mot). 



The crag martin has been found within our provinces only on the 

 mountains listed above, on all of which it seems to occur commonly 

 but irregularly throughout the year, from 4,600 to 5,500 feet. 



Above the summit of Doi Suthep, as well as on Doi Chiang Dao, this 

 swallow was usually seen in company with the gray-rumped swiftlet. 



The dusky crag martin has the entire plumage dark grayish brown 

 (paler below), the feathers of the chin, throat, and upper breast 

 broadly margined with pale rufous ; each of the rectrices, except the 

 central and outermost pairs, with a large white spot on the inner web. 



The white spots on the tail feathers will be sufficient to distinguish 

 the present species from any swift that may occur with it. 



RIPARIA RIPARIA IJIMAE (Liinnberg) 



Japanese Gorgeted Sand Martin 



Clivicola riparia ijimae Lonnberg, Journ. Coll. Sci. Imp. Univ. Tokyo, vol. 23, 

 art. 14, 190S, pp. 38-39 (Sakhalin Island). 



An unsexed, worn, and badly mutilated specimen, shot by me at 

 Ban Na Noi (Nan Province), April 2, 1937, is the sole example of the 

 species yet known from Thailand. 



This bird, the only one of its kind observed at Na Noi, was associated 

 with a migrating flock of house swallows, sailing above the small 

 river (tributary to the Mae Nan) that flows just east of the town. 

 At Ban Pha Tao, however, a few miles south of our limits, on April 10, 

 numerous others were seen (but could not be collected) with a great 

 flock of Hirundo rustica subspp. over an area of broad sand bars. It 

 appears then that the Japanese sand martin is by no means a rare 

 visitor, at least to the basin of the Mae Nan. 



The present form has the entire upperparts gray-brown ; the under- 

 parts white, except for a broad gray-brown breast band. 



RIPARIA PALUDICOLA CHINENSIS (J. E. Gray) 



Chinese Brown-throated Sand Martin 



Hirundo chinensis J. E. Gray, in Hardwicke, Illustrations of Indian zoology, 

 voL 1, pt. 2, 1830-1832 [=1830], pi. 35, fig. 3 (no locality given=China). 



